There is absolutely no one else on UA-cam who can hold a candle to this guy when it comes to teaching mechanics. I've learnt so much from Matt's videos, and I've fixed many faults using his knowledge. Thanks so much, Matt!
Mat is very good at what he does .. . Also scanner Danner.... Diagnose Dan ... South main auto ... And a few others as well .... Thanks mat for the education you are a great teacher .
You’re enthusiasm is extremely motivating. I’m a full time technician and shop owner and you have me sitting here editing my own notes I’ve made from my own self learning. Brilliant material
I am taking. a fuels class at a local community college and YOU are my real instructor with the Pearson Automotive book. Your approach is pedagogically outstanding, interesting and of the utmost clarity. I watch you videos on the Stairmaster and work out longer so I can watch the end. Thank you brilliant.
As an Elec. Tech. For 30 yrs. I have never gotten into fixing my own autos, as I am no auto mechanic. But your explanation of how sensors work in relationship to how the car is running, made it easy to understand. I have used O scopes and meters all my life. So once I understood how everything ties together, reading and interpretation of my scan tools PID's & graphs was no problem. thanks again for your informative tutorials.
Ended up here because I have a mazda cx5 with a p420 code (comes on and off from time to time) and I refuse to take it to the dealer so that they can change the Cat the A/F and the 02 without actually fixing the problem. Love the way you explained the A/F sensors so much I watched a ton of your videos just for fun. I am an aeronautical engineer and I am very amazed at your knowledge of the different systems and sensors. I love how you hate the shotgun repair methodology that the 98% uses. I used to be a mechanic and I constantly got in trouble with my boss because I wanted to be 100% sure of a diagnostic before replacing parts. Keep it up man.
I just subscribed. I stopped doing automotive repair professionally about 30 years ago, mostly because of engineers, as demonstrated in the video where you were trying to remove the fuse box cover with the hood prop in the way. I loved diagnostics, hated trying to access the problem after it was diagnosed. Anyway I continued to work as a mechanic, just not on cars. I wish you were my neighbor. There are a lot of things we could discuss that have changed in the last 40 years. Such as fuel quality. I really like your videos. Thanks.
Thank you so much for these videos. The data from my scan tool is becoming more and more meaningful and I really like the way you explain the functioning of the components and how they inter-relate e.g. your video about the MAP, MAF and TPS - and how this is displayed on the scan tool with an actual engine. This really gets my brain working and has already saved me money. I'm going to subscribe right now.
Outstanding video, very well explained and detailed. I'm an avid Fan of all you UA-cam Mechanics and this video was very educational in understanding the AF ratio sensor. Keep up the great work!!
Not seeing many O2 sensor problems, but when ever I come across one I always rewatch these videos, given it's age and video quality its like an old dusty book that holds secrets about valuable treasure.
Again, hugely helpful. Your 4 cylinder remarks were a hoot. It reminds me of flight school when I had an instructor who had 7,000 hours training in Tweety Birds (Cessna T-37 Tweet) The flight commander told me he gave me one of the best instructors, and that he had over 7,000 hours training pilots in the T-37 converters. I learned later that they called them converters because they convert fuel and air into noise. That would be a good fit for the Subaru you drove it sounds like. Much later I heard others talking about, "I took my initial training in the 6000 lb. dog whistle." (They definitely whistle) That would probably fit the 1.1 liter turbo 4 cylinders.
I wonder if a 4cylinder would even get a plane off the ground lol. Pretty sure you would have to get over 80MPH within a mile distance to pull it off!!!
I just finished both parts and am very impressed. I was following along with my old Engine Performance Diagnostics textbook that was part of my 3rd year diagnostics/drivability portion of my training. I was doing this because the classroom portion of our training on AF sensors was overkill with confusing theory that made little sense to a bunch of guys who had just finally started getting their heads wrapped around regular O2 sensors lol. You did a great job explaining it, and the real life demo was awesome and something that is missing from a lot of trade schools. They beat you to death with theory and then give minimal practical training. As a journeyman, I work with up and coming apprentices a lot, and I will be recommending your channel to them for sure, as it would have helped me out greatly back in the day! Oh, and even though I am a professional technician, I learned something new today, and I am not ashamed to admit it lol. I always tended to ignore the equivalency ratio pid (usually displayed on a scan tool as a (%) symbol for those of your viewers that might be looking for the words "equivalency ratio") but your explanation helped me better understand why the engineers included it, and already my mind is compiling ways to apply it to diagnostics! The day you stop learning in this trade you might as well pack up your tools and go home.
@Jeffrey- thanks as always for your feedback and referrals. As we've discussed offline, I am always interested to get insights from the professional community. I originally started this channel for serious "ShadeTree" mechanics but about 20% of my subscriber base turns out to be people like you who are well trained professionals which I find quite flattering! I wasn't sure if this unexpected subscriber base is because this type of training is lacking in the professional world, it just isn't explained very well, or there just was never interest in it by students until they hit the "real world" and now they realize they need to learn it. Either way- I appreciate people like you who understand the purpose of this channel. While I seldom do "How to change an X" vids which I know would tend to get 100X more views, I plan on generally staying true to my base of sticking with evidence-based diagnostics and know I will have a far more educated and dedicated subscriber base. I'll probably never hit 100K subscribers with my material, but I guess that's great news for AutoZone and the plug, wire, and O2 sensor manufacturers lol!! Cordially, Matt.
Schrodingers Box Matt - Im glad to hear that 20% or your subs are pros..does not surprise me at all really. This trade is a very different trade from most other skilled trades. Take carpentry, plumbing or electrician for example. Besides changes in building codes and government regulations here and there, the theory and methodology of those trades doesn't change much over the career of the tradesman. I have friends who are professionals in each of these trades and they agree with me on these comments so I feel confident in what I am saying. I have one friend who has been a Journeyman Electrician who has been in the trade for 8 years, and has never had to attend a training course on new technology, and even the original $1000 worth of tools he purchased as an apprentice are the same tools he uses today. I currently own $35,000 worth of tools, and have to buy something new at least once a month to accommodate the ever changing cars I work on. I have worked with many mechanics that have been in the trade for 30 or more years who have had to transition from basic mechanical ignition and fuel systems to complete computer and electrical control of almost all systems. These old guys deserve a pat on the back for sticking it out because the ones who made it had to attend constant evening training seminars (usually out of their own pockets I might add, unless they had a good boss who understood the importance of training and bucked up and paid for it) and suffer through YEARS of being used by manufacturers as test subjects for trouble shooting! Manufacturers sometimes pump things out so fast that even their engineers don't know how they are going to react in the real world. Good information and training has always been available in the trade, it just tended to be expensive, inconvenient and way to broad. Technicians want relevant, content specific information that is quick and easy to access and makes clear and useful real world practical sense. UA-cam has become the perfect forum for that, and your channel is riding a trend that is shifting from "how to replace part x" vids, to "how system x works in theory, and what can i expect to see in the field" vids. Code specific videos are something you should include whenever you can, but I agree with you 100% that sticking to your evidenced based diagnostics backed up with real world proof is the way to go! Case study vids that clearly and concisely walk through the entire diagnostic method, including the portions where you might go down the wrong path and then have to change direction. You have the right balance of technical data and clear and simple explanations that appeal to both pros and DIY's.. I honestly think the only thing that would hold you back from getting 100,000 subs is that you can't pump out vids fast enough!! lol. Sorry about the novel I just wrote again but hey..if I have to piggyback on your 1k plus subs to have a forum for my soapbox, I'm gonna do it! LOL. I would be happy if I changed just one persons opinion from negative to positive about professional mechanics :)
Thank you for all you research and time you put into this video. I am a full time mechanic and I am still constantly learning. I mostly work on older cars because my prices are fairly low and that's what usually comes in the door. Most of the time I just use my little code reader and not my scanner .This evening I was working on an 06 caddy CTS and had my scanner plugged in and for the first time saw the term lambda. I have watched quit a few videos tonight trying to learn these new(to me) parameters and terms.And your video has been the most informative by far, compared to most of these so called mechanics that post videos. THANKS AGAIN !!!! P.S. Almost to 5000 subscribers, congratulations in advance !!
You're welcome chevyman, that's a great story on the caddy. Yeah that's a pretty weird experience the first time you run into a wideband sensor. Almost as weird as the first time you try to change a starter on a caddy with a Northstar and realize the starter is actually under the intake manifold!!
Great job Matt. I have been doing quite a bit of research on these sensors myself due to the fact that these type of sensors are on Cummins ISL 9 Engines. But on the Cummins Engines they are called Nox sensors. As far as I can tell from what I have seen the Nox sensors work on the same basis. The bummer is the factory scan tool does not show Nox data. So I am in the process of figuring out a way to read the current on one so I can use it as a diagnostic aid. One option is I buy a 600.00 dollar micro amp probe or I figure out a way to make a custom current shunt with a low range so I can read the voltage drop across it with my Pico Scope. Once I get it figured out I'll show everyone. I do know for a fact that the micro amp probe works great on air/fuel sensors, just don't want to have to pay 600.00 bucks unless I have too. What do you do for a living again Matt? I thought you said you are some sort of scientist?
Absolutely the best tutorial. Awesome!! I’m an old school mechanic, points, rotor carburetor, distributor kind of time. I trying my hand on a fixer upper ‘08 Silverado. Very helpful!!!!!!!
@@SchrodingersBox I am accepting the challenge & fun of course, and you're my mentor, I am so glade to have found your tutorial. I may have questions on my diagnosis process, are you open for questions if I may need some guidance? I appreciate your site!
I've been to automotive school, back in the 80's, I am still a licensed journeyman,no longer in the trade, and I think you would fit right in as an instructor. These two videos where so full of good information, easy to follow and understand! Great work! I will subscribe and watch your other videos; Thanks for doing this! Joe
Appreciate your time making these videos. I feel like I am reaping all of the benefits of your hard studying in only a few hours of watching your videos. I am getting a much better understanding of how to comprehend what my scan tool data is showing me (Torque). After watching your video on fuel trims and now these 02 videos, I actually have some useful knowledge to apply to my damn lean condition code. Subscribed.
Hi Matt. You've got some very good videos with lots of detailed information. I'm sure that if anyone wants to learn about the diagnostics of autos, they'll find your videos very helpful. Good work Matt in your narration and demonstration of how wideband sensors work. Take care Matt.
thanks for all the videos. I started to learn mechanics as a hobby and I can truly say that most of my knowledge is from the videos you publish. Know that you have quite a few fans in Israel
Awesome video, especially the acid test to the air/fuel sensor at 19:00, which is very simple and and reliable test. I am already looking forward to your next videos and your whole bag of tricks to deal with engine performance issues. Thanks for sharing your thoughts, you're really on the ball with that
Thanks! I just started playing with an xtool D7 to diagnose a p0420 code on my 2002 4runner. The live data on the a/f sensor behaved exactly like yours in the video. The downstream O2 reads low voltage, I still have to check for a gasket leak before the cat before replacing anything. But your videos have kept me from loading up the old parts cannon before I know what caused the code. Thanks again!
Great Videos and explanation. As a D.I>Y just getting into OB2 diagnosis, it is a real blessing to come across your videos and your theory to come to a scientific proof before wasting time and money on parts.Case and point, I had a truck with a bad cat and took it to the dealer for emissions warrenty. A previous mechanic who had diagnosed the bad cat even left the code for the dealer. The newbie dealer mechanic erased the code and just made the assumption I needed a $1100 tune up which I did not accept. Long story short...test, don't guess
Thank you so much for this. I have a 2001 Volvo V70 II T5 (5 cylinders which will amuse you no doubt) and I am learning to use the VIDA DICE scan software on a notebook. Agreed - most of what I have read out there is rubbish. Now I am beginning to make sense of the data. Great stuff
Thank you for that terrific overview of wide band sensors. Recently picked up a 2005 Toyota Camry 6 cylinder as a second vehicle for long distance highway driving and it has upstream wide band sensors. Also really glad I picked up the Autoenginuity software last year thanks to your channel and videos on fuel trim and scanner options.
Sir u have opened my mind to this subject I watch both the fuel trim and this I just had a 12hr day at work n I watched all today all I can say is thank you and I just subscribe I will continue to watch all ur videos
This is a great explanation on how the wideband sensor can be tested and compared to the ER data pid, this has been very helpful for me, thanks for sharing this.
Great video, I would suggest that the people that watch them and have questions watch your video a number of times till they really start to understand them.
Totally true. WHen I teach myself this stuff I normally have to do it over and over and over. Very seldom do I just read it out of the service manual and comprehend it enough to do it myself. Actually.... never. I often have to redraw the wiring diagrams by hand and review the concepts multiple times.
I love the detail and the delivery. Outstanding video set all around. On the other hand, I love Subaru cars, and I would suggest that you test drive a new Impreza STi. Between the chassis, the lowly flat four engine, the wonderful sound it makes, and the general driver/car zen, you might send your Trans Am to the Smithsonian where it belongs:)) Keep up the good work!!!
Thanks for how you excel diagnosing . I will be attending more of your videos daily so keep up the good work and be intense about it. Enjoy your intelligence
What a wonderful scientific approach to understanding how a car works. Extremely helpful. Please post more of these videos for Mass education. Thank you.
Matt, thanks for your time and effort. I really appreciate you and your videos! You are very thorough. Great instructors are rare. Thanks for everything.
Great video on wide band o2 sensors. I am a scientist like you that like approaching diagnostics from a scientific standpoint. Thanks for your great videos and being honest how you feel about automotive issues.
Have'nt come across wide band sensors,[toyota yaris 00] in any car so far but from the video, far more accurate.Can see confusion with rich and lean in opposite directions.As you say, the multimeter is for the museum.An om 580 scanner can graph pid's and record and playback live input and is not overly expensive.Great video for the novice and experienced diy mechanic.
really thanks for your useful and helpful videos. you are my preferred teachers on the you tube channels because your method is logic, simple and accurate using the basic tools. you totally changed my diagnosis strategy. appreciated effort. keep going my teacher
Good educational video, keep em coming. Seems easy enough the air flow does two operations where the 0 2 sensor will lead you to look for other problems. I think its all about the money, the air/flow will probably cost two and a half times as much as just replacing an 0-2 sensor. Or possibly more, plus the new diagnostic machine will bump up the cost of getting the vehicle on the diagnostic machine. (all about the money)
Im a professional tech and have never seen a/f ratio sensors explained as well as you did. Thank you! you should be a teacher at a tech school for auto repair.
Thanks for another GREAT video!!! I now feel much more confident in looking at the a/f sensor data on my job of fixing a p0420,430. I had already looked at the data but was unsure of what I was really looking for and seeing, but now cant wait to get back and take another look. Again THANKS!!
This vid helped me put together some bits of info that used to be confusing. Also i find it amusing how you can focus on tech so much and still be ignorant at the fact that a 4 cyl boxer engine in a lighter vehicle could be almost as fast as a v8 muscle car, if not faster.
I have Honda Accord 2003 with wideband sensor, first time i looked at scan data I was surprised to see that flat line )) Now I know what that flat line mean )) thanx for great video. Going to hook scan tool to Accord and try some tests I have seen here ))).
Till May - If you wouldn't mind posting some of the numbers you find with the A/F voltage on the Honda I would find that extremely helpful as would others! Please do that as soon as possible because I don't want to wait til May.
Schrodingers Box I tested for HONDA pilot 2005 that has wideband, Autoengunity is showing only MILLIAMPS pids and not volts. and surprisingly the wave form is showing very little change on rich and good amplittude on lean. surprisingly the down stream pids have voltage and fuel trim for O2 sensor.. kind of intresting and confusing, seeing first time for an O2 sensor fueltrim pid for downstream.
sivaraj palanisamy Yes Sivaraj I have had other people email with similar information, most recently a shop owner with a Jaguar XK8 with mA pids only and they switched like an O2 sensor between -128mA and 128mA. I have not seen enough cars to know what PIDs are or are not available. I would probably check to see if Equivalency Ratio was available if voltage was not. If only mA is available, then that's a problem- the data would be completely useless without knowing the specs for the particular vehicle since the mA clearly varies widely between vehicles. The Subaru in the video for example shows well under .5mA current- a far cry from the 128mA in the Jaguar.
Honda does have ER ratio in addition to MA.. however i am surprised the downstream sensor have O2 fuel trim PID value. I am not referring to STFT and LTFT. it say O2 fuel trim pid on downstream.. kind of interesting didnot get time to investigate, if i did will post you.
Great explanatiion. it is a 6 year old video and im first learning about these A/F sensors. i recently boaght a new scanner and was trying to figure out the missing 02 sensor. There is one, its downstream . the other 2 were AF. Now i can understand these thanx to your vid. plus i did take notes and drawings too. Yes you can teach an old dog new tricks.
Thanks for taking the time to create another great tutorial. I have a comment regarding the Subaru WOT test. I am assuming since this is a new vehicle it is equipped with a drive by wire throttle. The drive by wire throttle is the likely cause of the linear ramp on the graph from stoic to full rich condition. There is a lag when going to WOT with drive by wire, probably to help with emissions and maybe help protect the engine. Some cars have more lag than others. This will also explain the instantaneous lean condition when you let off as there is no lag when coming off the throttle. I may be wrong but it seems logical to me Keep up the great work.
Replaced a bank 1 a/f with 02 sensor once. Ecm did not like that at all. Had to buy a/f and 02 sensor. Expense expirament. They are "not" direct replacement for each other. Great vidio on understanding this a/f system. Thank for putting it together.
Abelardo Orellana Thanks friend. People who invest in learning this will be in very high demand in a few years. O2 sensors will be a thing of the past before too long- no new cars will use them.
Actually the wideband o2 sensor (AFR) is pretty handy way to monitor your car running, especially when you are doing some mods. I added one into my car, just right at the beginning of the exhaust, then I'm using some "super-hiper fancy" stuff to show me values on a gauge that is mounted in my cabin. That's a really cool way to live monitor your running car, specially if you run a big boost from turbo. To sum it up - wideband o2 for me is a great monitoring tool, that my engine doesn't use at all :)
WOW! You should have way more subs by now. You weren't kidding about the 2%. This is better than Apex and Lincoln Tech combined, all while sitting on the 🚽! In appreciation for now, until I enroll. You were drinking a diet Sunkist. See if it has a ingredient called "Aspartame", look it up! Thanks again! God bless!!!
@@SchrodingersBox Molecular Biologists, wow, nice title! Me, I'm not the sharpes tool in the shed. When you spoke about the sensors being as witness in a court of law, it reminded me of something else I was currently viewing. This will be a change of pace from automobiles: ua-cam.com/video/xU60nNhcXtY/v-deo.html I'm sure you could appreciate this, as I know most people wouldn't even comprehend it. Thank you again for all your help! God bless!!!
Great observations! I've been considering getting Autoenginuity myself. I currently use a Bluetooth scanner with my Android Phone. Torque is the paid app with the Torque Scan paid "plug in" in addition. It doesn't include near as many PIDs as Autenginuity, but the O2's, A/F sensors, STFT and LTFT are included. Also MAF, IAT, TPS, MAP, Engine Load , CMPS, CPS, CTS.and includes graphing and custom Gauges. Not bad for an investment of $30-40.
Good job on your presentation.....!!! My only comment is....alot of the lesser expensive scanners do not have the ER scale...but even the lower-end scan tools will have Short Term Fuel Trim(STFT). I generally use STFT on diagnosis so that I do not confuse myself with voltage scaling. At 10am I can be scanning a car with O2 sensors, then at 12pm scanning a car with A/F sensors. But, fuel trim is the same with both. The only problem would be with a dampened meter - the reaction time can be slow. I'm fortunate enough to have a VERUS bi-directional scanner at my disposal, so I can isolate O2 readings and graph them in almost "real time". I thought your viewers may enjoy you doing a "fuel trim" vid to show how they can use the scan tool to do essentially the same test you did on this vid. Keep up the good work.
hi, couple of tips, before checking wide band, we need to check if heater circuit is functioning properly to be on safe side, i suggest to test during closed loop. veryinformative, i learned about ER today.
Rýán Túçk He is referring to Equivalence Ration which is explained in the video. Briefly, it normalizes the sensor's output to equal 1 if the sensor is in stoichiometric.
It is a great video! I came from the other side, I learned to use lambda values (equivalent ratio) with a wide band bosch sensor when I turbo charged my old audi 80 quattro. (It was a 4 cyl (lol) around 300hp) If you wot the engine in EQ you sould see something around 0.84 at full load if we talking about an engine with injectors at the intake manifold. The direct injected engines are different, they can work on lambda 1 most of the time, even in wot. (soon I watch and understand all your free vids, so you will have an another sub for the other chanel :) thanks for the great content)
+zracer81 Thanks man... but I bet your opinion about Subarus would change if you ever have to replace a head gasket in one with 180 degree cylinder heads!
Very true. As a hobby I buy Subarus with problems and fix them up and resell them. Headgaskets are a major repair - done about a dozen of them and the easiest way I think is to just pull the engine out. Tried doing it with the engine in the car ended up using more of the f-word than any other tool in my garage.
didn't know you could do them with engine in car. I wouldn't even attempt that. in fact on most cars I find it easier to just pull the engine and ensure my torques are accurate.
Garth Goldberg Subarus often have cylinder heads that are located 180 degrees apart- e.g. the valve covers are across the engine in a straight line from sidewall to sidewall as opposed to the usual 60 degree "V" shaped design
I love your explanations. One of my car's wide band sensor is showing 0.0 volt on left bank and on the right bank it's fluctuates from 1.5 to 5. I believe the left bank sensor is dead. It's a V8 1UZ FE Toyota engine.
I'm loving it... I'm glad I bumped into your channel... You definitely are a teacher.. Because I totally understand everything you are teaching. And a trick I just learned. To find a vac leak. Just as long as you are careful with a HOT engine. Hahaha. Wow awesome. Thanks... And of course I subscribed👍🏼👍🏼👍🏼👍🏼👍🏼💯💯💯💯💯🥵
Great class Shrodinger!! I worship you insight, man! Just came to mind that a 14.7:1 stochometric ratio is for a classic gasoline free of ethanol, called E0 fuel, but with a nowadays more common grades like E10 is about 14.4:1 and as a lot are E15, having a ratio of about 14.1:1. So, I'm trying to give a headsup, if I'm right. Congrats on your videos.
Yes other people have indicated that and I have not actually looked into it. It seems reasonable and when I get some time to look into I'll most certainly introduce the concept.
Great video! Additionally, the equivalent ratio es the lambda so if you had included in on your WOT run I'm pretty sure it was around 0.75 to 0.8 where gasoline engines produce more torque. And that value multiplied by 14.7 would give the actual a/f ratio.
Until I saw these videos I didn't know what to look for to tell the difference. At least now I know. As an aside, when you were talking about dvom's, I remembered a meter I bought nearly twenty years ago. Not only was it able to measure current it could do min-max holds. The meter was a micronta (radio shack) dvom. I still have it but I'd have to see whether it could react fast enough to do everything needed for the test. It was a hundred bucks back then so if it's capable then that makes it pretty advanced for it's time. Looks like I need to dust it off and give it a try.
Thanks Matt, your brilliant, I always wondered why sometimes on some cars produce an equivalence ratio pid and thanks to you i now know. Thanks mate, kind regards Jay 😊
Imagine that I drive a 2 cylinder car (2014 Lancia Y 0.9 Twinair turbo gasoline/CNG engine, gotta love Italy). You would go crazy! :) However that car is what brought me to this channel, so lucky me! Actually, coming from a different region (Europe), I was amazed when I heard about ginormous 6.0 L V8 engines that are so common in the US, the trend here is to have smaller engines (1.0 to 2.0 L) with turbocharging, VVT and all kinds of technology which "squeezes" the hell out of the engine and (theoretically) reduce emissions and maximize efficiency. Most city and smaller cars have actually 3 cylinders here, many with GDI. Also, we have turbocharged Diesel engines, still very popular, which I don't think are that common in the US.
Yes great comment. I have many many many European viewers and I have come to be very familiar that smaller engines are far more common there and I also get asked several times a day by European viewers if I have any videos on diesels (I do not). It’s a totally different culture however I can tell you America is definitely trending to smaller engines- there’s no doubt. But the diesel thing never caught on here. I believe electric cars will by far become more prevalent than diesels ever will here.
thanks. you're a good teacher and you explain very well as well. now I know that my upstream is an A/F and not an O2 sensor thanks to you. I thought that it was an O2 sensor and not responding well and stuck on about 3.5v to 4.5v. even my scan tool showed me the result in mA instead of volt , I was wandering why. many thanks .
thank you so much sir its been a long time i dont understand the wideband oxygen sensor but now i totally understand because of you sir im so much happy now before only a tradional O2 only i uderstand thank you so much sir.....
Thank you for videos and also for sharing your knowledge. Very useful these explanations! Really, you love what you do and you're doing it very good! Congratulations!
very interesting stuff, in the industrial electrical world the use MA signals as a standard, they must now be introducing it into the auto world. thanks for the info my friend...
Very good lessons,although I couldn’t absorb everything yet,but it’s very helpful,I need to apply in real time,but couldn’t afford to buy a scan tool to do so....
There is absolutely no one else on UA-cam who can hold a candle to this guy when it comes to teaching mechanics. I've learnt so much from Matt's videos, and I've fixed many faults using his knowledge. Thanks so much, Matt!
Totally agree
Thanks Andy!! I am sure I don’t even have to ask, but did you get the book?
Mat is very good at what he does ..
. Also scanner Danner.... Diagnose Dan ... South main auto ... And a few others as well .... Thanks mat for the education you are a great teacher .
Great explainer
You are an excellent teacher where have you been all these years man you are indeed a blessing to car users and technicians.
Wow, thanks! Glad to help!
You’re enthusiasm is extremely motivating. I’m a full time technician and shop owner and you have me sitting here editing my own notes I’ve made from my own self learning. Brilliant material
Great to hear!! Thank you!
I am taking. a fuels class at a local community college and YOU are my real instructor with the Pearson Automotive book. Your approach is pedagogically outstanding, interesting and of the utmost clarity.
I watch you videos on the Stairmaster and work out longer so I can watch the end. Thank you brilliant.
What a compliment!! Thanks!!
As an Elec. Tech. For 30 yrs. I have never gotten into fixing my own autos, as I am no auto mechanic. But your explanation of how sensors work in relationship to how the car is running, made it easy to understand. I have used O scopes and meters all my life. So once I understood how everything ties together, reading and interpretation of my scan tools PID's & graphs was no problem. thanks again for your informative tutorials.
Ended up here because I have a mazda cx5 with a p420 code (comes on and off from time to time) and I refuse to take it to the dealer so that they can change the Cat the A/F and the 02 without actually fixing the problem. Love the way you explained the A/F sensors so much I watched a ton of your videos just for fun. I am an aeronautical engineer and I am very amazed at your knowledge of the different systems and sensors. I love how you hate the shotgun repair methodology that the 98% uses. I used to be a mechanic and I constantly got in trouble with my boss because I wanted to be 100% sure of a diagnostic before replacing parts. Keep it up man.
I just subscribed. I stopped doing automotive repair professionally about 30 years ago, mostly because of engineers, as demonstrated in the video where you were trying to remove the fuse box cover with the hood prop in the way. I loved diagnostics, hated trying to access the problem after it was diagnosed. Anyway I continued to work as a mechanic, just not on cars. I wish you were my neighbor. There are a lot of things we could discuss that have changed in the last 40 years. Such as fuel quality. I really like your videos. Thanks.
Thanks for the kind comment!!!
Thank you so much for these videos. The data from my scan tool is becoming more and more meaningful and I really like the way you explain the functioning of the components and how they inter-relate e.g. your video about the MAP, MAF and TPS - and how this is displayed on the scan tool with an actual engine. This really gets my brain working and has already saved me money. I'm going to subscribe right now.
Outstanding video, very well explained and detailed. I'm an avid Fan of all you UA-cam Mechanics and this video was very educational in understanding the AF ratio sensor. Keep up the great work!!
Not seeing many O2 sensor problems, but when ever I come across one I always rewatch these videos, given it's age and video quality its like an old dusty book that holds secrets about valuable treasure.
hahaha I have to admit I even look back on this one too sometimes lol.
Again, hugely helpful.
Your 4 cylinder remarks were a hoot. It reminds me of flight school when I had an instructor who had 7,000 hours training in Tweety Birds (Cessna T-37 Tweet) The flight commander told me he gave me one of the best instructors, and that he had over 7,000 hours training pilots in the T-37 converters. I learned later that they called them converters because they convert fuel and air into noise. That would be a good fit for the Subaru you drove it sounds like. Much later I heard others talking about, "I took my initial training in the 6000 lb. dog whistle." (They definitely whistle) That would probably fit the 1.1 liter turbo 4 cylinders.
I wonder if a 4cylinder would even get a plane off the ground lol. Pretty sure you would have to get over 80MPH within a mile distance to pull it off!!!
I just finished both parts and am very impressed. I was following along with my old Engine Performance Diagnostics textbook that was part of my 3rd year diagnostics/drivability portion of my training. I was doing this because the classroom portion of our training on AF sensors was overkill with confusing theory that made little sense to a bunch of guys who had just finally started getting their heads wrapped around regular O2 sensors lol. You did a great job explaining it, and the real life demo was awesome and something that is missing from a lot of trade schools. They beat you to death with theory and then give minimal practical training. As a journeyman, I work with up and coming apprentices a lot, and I will be recommending your channel to them for sure, as it would have helped me out greatly back in the day! Oh, and even though I am a professional technician, I learned something new today, and I am not ashamed to admit it lol. I always tended to ignore the equivalency ratio pid (usually displayed on a scan tool as a (%) symbol for those of your viewers that might be looking for the words "equivalency ratio") but your explanation helped me better understand why the engineers included it, and already my mind is compiling ways to apply it to diagnostics! The day you stop learning in this trade you might as well pack up your tools and go home.
@Jeffrey- thanks as always for your feedback and referrals. As we've discussed offline, I am always interested to get insights from the professional community. I originally started this channel for serious "ShadeTree" mechanics but about 20% of my subscriber base turns out to be people like you who are well trained professionals which I find quite flattering! I wasn't sure if this unexpected subscriber base is because this type of training is lacking in the professional world, it just isn't explained very well, or there just was never interest in it by students until they hit the "real world" and now they realize they need to learn it. Either way- I appreciate people like you who understand the purpose of this channel. While I seldom do "How to change an X" vids which I know would tend to get 100X more views, I plan on generally staying true to my base of sticking with evidence-based diagnostics and know I will have a far more educated and dedicated subscriber base. I'll probably never hit 100K subscribers with my material, but I guess that's great news for AutoZone and the plug, wire, and O2 sensor manufacturers lol!! Cordially, Matt.
Schrodingers Box Matt - Im glad to hear that 20% or your subs are pros..does not surprise me at all really. This trade is a very different trade from most other skilled trades. Take carpentry, plumbing or electrician for example. Besides changes in building codes and government regulations here and there, the theory and methodology of those trades doesn't change much over the career of the tradesman. I have friends who are professionals in each of these trades and they agree with me on these comments so I feel confident in what I am saying. I have one friend who has been a Journeyman Electrician who has been in the trade for 8 years, and has never had to attend a training course on new technology, and even the original $1000 worth of tools he purchased as an apprentice are the same tools he uses today. I currently own $35,000 worth of tools, and have to buy something new at least once a month to accommodate the ever changing cars I work on. I have worked with many mechanics that have been in the trade for 30 or more years who have had to transition from basic mechanical ignition and fuel systems to complete computer and electrical control of almost all systems. These old guys deserve a pat on the back for sticking it out because the ones who made it had to attend constant evening training seminars (usually out of their own pockets I might add, unless they had a good boss who understood the importance of training and bucked up and paid for it) and suffer through YEARS of being used by manufacturers as test subjects for trouble shooting! Manufacturers sometimes pump things out so fast that even their engineers don't know how they are going to react in the real world. Good information and training has always been available in the trade, it just tended to be expensive, inconvenient and way to broad. Technicians want relevant, content specific information that is quick and easy to access and makes clear and useful real world practical sense. UA-cam has become the perfect forum for that, and your channel is riding a trend that is shifting from "how to replace part x" vids, to "how system x works in theory, and what can i expect to see in the field" vids. Code specific videos are something you should include whenever you can, but I agree with you 100% that sticking to your evidenced based diagnostics backed up with real world proof is the way to go! Case study vids that clearly and concisely walk through the entire diagnostic method, including the portions where you might go down the wrong path and then have to change direction. You have the right balance of technical data and clear and simple explanations that appeal to both pros and DIY's.. I honestly think the only thing that would hold you back from getting 100,000 subs is that you can't pump out vids fast enough!! lol. Sorry about the novel I just wrote again but hey..if I have to piggyback on your 1k plus subs to have a forum for my soapbox, I'm gonna do it! LOL. I would be happy if I changed just one persons opinion from negative to positive about professional mechanics :)
Jeffrey Wilson As a fellow novelist when it comes to comments, no problem! :)
Thank you for all you research and time you put into this video. I am a full time mechanic and I am still constantly learning. I mostly work on older cars because my prices are fairly low and that's what usually comes in the door. Most of the time I just use my little code reader and not my scanner .This evening I was working on an 06 caddy CTS and had my scanner plugged in and for the first time saw the term lambda. I have watched quit a few videos tonight trying to learn these new(to me) parameters and terms.And your video has been the most informative by far, compared to most of these so called mechanics that post videos. THANKS AGAIN !!!! P.S. Almost to 5000 subscribers, congratulations in advance !!
You're welcome chevyman, that's a great story on the caddy. Yeah that's a pretty weird experience the first time you run into a wideband sensor. Almost as weird as the first time you try to change a starter on a caddy with a Northstar and realize the starter is actually under the intake manifold!!
Great job Matt. I have been doing quite a bit of research on these sensors myself due to the fact that these type of sensors are on Cummins ISL 9 Engines. But on the Cummins Engines they are called Nox sensors. As far as I can tell from what I have seen the Nox sensors work on the same basis. The bummer is the factory scan tool does not show Nox data. So I am in the process of figuring out a way to read the current on one so I can use it as a diagnostic aid. One option is I buy a 600.00 dollar micro amp probe or I figure out a way to make a custom current shunt with a low range so I can read the voltage drop across it with my Pico Scope. Once I get it figured out I'll show everyone. I do know for a fact that the micro amp probe works great on air/fuel sensors, just don't want to have to pay 600.00 bucks unless I have too. What do you do for a living again Matt? I thought you said you are some sort of scientist?
busjockey1 I have been a molecular biologist for about 22 years now. Currently I work in a technical consulting role for a scientific company.
Absolutely the best tutorial. Awesome!! I’m an old school mechanic, points, rotor carburetor, distributor kind of time. I trying my hand on a fixer upper ‘08 Silverado. Very helpful!!!!!!!
Never too late to learn. The old stuff is definitely easier but the new stuff is way more fun if you like a challenge.
@@SchrodingersBox I am accepting the challenge & fun of course, and you're my mentor, I am so glade to have found your tutorial. I may have questions on my diagnosis process, are you open for questions if I may need some guidance? I appreciate your site!
Always glad to answer questions. Good luck on your journey!
Hello Matt, I just want to thank you for your teachings and the great job you do on your channel.
Very much appreciated!! Merry Christmas!!
I've been to automotive school, back in the 80's, I am still a licensed journeyman,no longer in the trade, and I think you would fit right in as an instructor. These two videos where so full of good information, easy to follow and understand! Great work!
I will subscribe and watch your other videos;
Thanks for doing this!
Joe
Wow 8 years ago and the best video ive found on wideband and testing in the real world
Appreciate your time making these videos. I feel like I am reaping all of the benefits of your hard studying in only a few hours of watching your videos. I am getting a much better understanding of how to comprehend what my scan tool data is showing me (Torque). After watching your video on fuel trims and now these 02 videos, I actually have some useful knowledge to apply to my damn lean condition code. Subscribed.
Hi Matt. You've got some very good videos with lots of detailed information. I'm sure that if anyone wants to learn about the diagnostics of autos, they'll find your videos very helpful. Good work Matt in your narration and demonstration of how wideband sensors work. Take care Matt.
I always get a new perspective every time i watch your videos. A fresh new way of looking at raw data. I feel enlightened.
thanks for all the videos. I started to learn mechanics as a hobby and I can truly say that most of my knowledge is from the videos you publish.
Know that you have quite a few fans in Israel
I second that!
Awesome video, especially the acid test to the air/fuel sensor at 19:00, which is very simple and and reliable test. I am already looking forward to your next videos and your whole bag of tricks to deal with engine performance issues. Thanks for sharing your thoughts, you're really on the ball with that
And now you are at 158,000 subscribers. Great work!! Love your channel.
Thanks man. Channel is on fire in last 3 weeks for some reason!!
Thanks! I just started playing with an xtool D7 to diagnose a p0420 code on my 2002 4runner. The live data on the a/f sensor behaved exactly like yours in the video. The downstream O2 reads low voltage, I still have to check for a gasket leak before the cat before replacing anything. But your videos have kept me from loading up the old parts cannon before I know what caused the code. Thanks again!
Great Videos and explanation. As a D.I>Y just getting into OB2 diagnosis, it is a real blessing to come across your videos and your theory to come to a scientific proof before wasting time and money on parts.Case and point, I had a truck with a bad cat and took it to the dealer for emissions warrenty. A previous mechanic who had diagnosed the bad cat even left the code for the dealer. The newbie dealer mechanic erased the code and just made the assumption I needed a $1100 tune up which I did not accept. Long story short...test, don't guess
Thank you so much for this. I have a 2001 Volvo V70 II T5 (5 cylinders which will amuse you no doubt) and I am learning to use the VIDA DICE scan software on a notebook. Agreed - most of what I have read out there is rubbish. Now I am beginning to make sense of the data. Great stuff
Thank you for that terrific overview of wide band sensors. Recently picked up a 2005 Toyota Camry 6 cylinder as a second vehicle for long distance highway driving and it has upstream wide band sensors. Also really glad I picked up the Autoenginuity software last year thanks to your channel and videos on fuel trim and scanner options.
+Sandbag1300 Yeah I still struggle "thinking backwards" on widebands but I am getting more comfortable with them
Sir u have opened my mind to this subject I watch both the fuel trim and this I just had a 12hr day at work n I watched all today all I can say is thank you and I just subscribe I will continue to watch all ur videos
This is a great explanation on how the wideband sensor can be tested and compared to the ER data pid, this has been very helpful for me, thanks for sharing this.
Found this channel while looking for tips for my L1 ASE, you sir have earned a sub.
Awesome, thank you! Suggest you check out my premium content at www.schrodingersboxQM.com.
Great video, I would suggest that the people that watch them and have questions watch your video a number of times till they really start to understand them.
Totally true. WHen I teach myself this stuff I normally have to do it over and over and over. Very seldom do I just read it out of the service manual and comprehend it enough to do it myself. Actually.... never. I often have to redraw the wiring diagrams by hand and review the concepts multiple times.
I love the detail and the delivery. Outstanding video set all around. On the other hand, I love Subaru cars, and I would suggest that you test drive a new Impreza STi. Between the chassis, the lowly flat four engine, the wonderful sound it makes, and the general driver/car zen, you might send your Trans Am to the Smithsonian where it belongs:)) Keep up the good work!!!
My two Subarus have 500k miles combined. Never give me any problems past a bad wiper blade.
The more I watch part 1 and 2 the more am away from being a part changer I love your videos thanks man
Thanks for how you excel diagnosing . I will be attending more of your videos daily so keep up the good work and be intense about it. Enjoy your intelligence
Well thank you!!
What a wonderful scientific approach to understanding how a car works. Extremely helpful. Please post more of these videos for Mass education. Thank you.
Thanks- I do try to keep this format for those like you who understand and appreciate it!
Matt, thanks for your time and effort. I really appreciate you and your videos! You are very thorough. Great instructors are rare. Thanks for everything.
Super Lesson ! I think you covered everything with simple to understand terminology and examples and circuit data waveforms .
Thanks !!
You are welcome!
Great video on wide band o2 sensors. I am a scientist like you that like approaching diagnostics from a scientific standpoint. Thanks for your great videos and being honest how you feel about automotive issues.
Have'nt come across wide band sensors,[toyota yaris 00] in any car so far but from the video, far more accurate.Can see confusion with rich and lean in opposite directions.As you say, the multimeter is for the museum.An om 580 scanner can graph pid's and record and playback live input and is not overly expensive.Great video for the novice and experienced diy mechanic.
really thanks for your useful and helpful videos. you are my preferred teachers on the you tube channels because your method is logic, simple and accurate using the basic tools. you totally changed my diagnosis strategy. appreciated effort. keep going my teacher
Thank you!!!
Natural teacher. Very well done.
Good educational video, keep em coming. Seems easy enough the air flow does two operations where the 0 2 sensor will lead you to look for other problems. I think its all about the money, the air/flow will probably cost two and a half times as much as just replacing an 0-2 sensor. Or possibly more, plus the new diagnostic machine will bump up the cost of getting the vehicle on the diagnostic machine. (all about the money)
Im a professional tech and have never seen a/f ratio sensors explained as well as you did. Thank you! you should be a teacher at a tech school for auto repair.
And yes, 4 cyls do suck !
mike withers With all the mods I've done, if it wasn't a 4, I'd have a screaming ride. Instead, I just have a fast car, for it being a 4. lol
DE Nichols remember- 5hp per sticker!
Lol! I have an extra 15 then for my website stickers.
Awesome explanation on differences between the two.!!!
I must say you are gifted at explaining detail like no other, Keep it up and thank you.
Sean
Thanks man!! Will do!
I really enjoy watching videos. Great explanation. I now understand the difference and operation of the A/F sensor.
Great to hear!
Thanks for another GREAT video!!! I now feel much more confident in looking at the a/f sensor data on my job of fixing a p0420,430. I had already looked at the data but was unsure of what I was really looking for and seeing, but now cant wait to get back and take another look. Again THANKS!!
This vid helped me put together some bits of info that used to be confusing. Also i find it amusing how you can focus on tech so much and still be ignorant at the fact that a 4 cyl boxer engine in a lighter vehicle could be almost as fast as a v8 muscle car, if not faster.
I have Honda Accord 2003 with wideband sensor, first time i looked at scan data I was surprised to see that flat line )) Now I know what that flat line mean )) thanx for great video. Going to hook scan tool to Accord and try some tests I have seen here ))).
Till May - If you wouldn't mind posting some of the numbers you find with the A/F voltage on the Honda I would find that extremely helpful as would others! Please do that as soon as possible because I don't want to wait til May.
Schrodingers Box I tested for HONDA pilot 2005 that has wideband, Autoengunity is showing only MILLIAMPS pids and not volts. and surprisingly the wave form is showing very little change on rich and good amplittude on lean. surprisingly the down stream pids have voltage and fuel trim for O2 sensor.. kind of intresting and confusing, seeing first time for an O2 sensor fueltrim pid for downstream.
sivaraj palanisamy Yes Sivaraj I have had other people email with similar information, most recently a shop owner with a Jaguar XK8 with mA pids only and they switched like an O2 sensor between -128mA and 128mA.
I have not seen enough cars to know what PIDs are or are not available. I would probably check to see if Equivalency Ratio was available if voltage was not. If only mA is available, then that's a problem- the data would be completely useless without knowing the specs for the particular vehicle since the mA clearly varies widely between vehicles. The Subaru in the video for example shows well under .5mA current- a far cry from the 128mA in the Jaguar.
Honda does have ER ratio in addition to MA.. however i am surprised the downstream sensor have O2 fuel trim PID value. I am not referring to STFT and LTFT. it say O2 fuel trim pid on downstream.. kind of interesting didnot get time to investigate, if i did will post you.
sivaraj palanisamy
An additional fuel trip off of the O2? Especially after the catalytic converter. Yes, I must learn more. :)
Wow! Thanks Matt! I was looking for this! I feel confident now with A/F sensors! And it's s now 67k subs, congratulations!
Great explanatiion. it is a 6 year old video and im first learning about these A/F sensors. i recently boaght a new scanner and was trying to figure out the missing 02 sensor. There is one, its downstream . the other 2 were AF. Now i can understand these thanx to your vid. plus i did take notes and drawings too. Yes you can teach an old dog new tricks.
Great information,tyvm for sharing!
Also very easy to understand the way you explain things
Thanks for taking the time to create another great tutorial. I have a comment regarding the Subaru WOT test. I am assuming since this is a new vehicle it is equipped with a drive by wire throttle. The drive by wire throttle is the likely cause of the linear ramp on the graph from stoic to full rich condition. There is a lag when going to WOT with drive by wire, probably to help with emissions and maybe help protect the engine. Some cars have more lag than others. This will also explain the instantaneous lean condition when you let off as there is no lag when coming off the throttle.
I may be wrong but it seems logical to me
Keep up the great work.
Yes I see your thinking. I should have validated actual TP% during the test.
Replaced a bank 1 a/f with 02 sensor once. Ecm did not like that at all. Had to buy a/f and 02 sensor. Expense expirament. They are "not" direct replacement for each other. Great vidio on understanding this a/f system. Thank for putting it together.
Thankyou Matt for sharing your knowledge your teaching on widebands a/f is exactly what I was looking for, good on you mate, and God bless you
Abelardo Orellana Thanks friend. People who invest in learning this will be in very high demand in a few years. O2 sensors will be a thing of the past before too long- no new cars will use them.
Actually the wideband o2 sensor (AFR) is pretty handy way to monitor your car running, especially when you are doing some mods. I added one into my car, just right at the beginning of the exhaust, then I'm using some "super-hiper fancy" stuff to show me values on a gauge that is mounted in my cabin. That's a really cool way to live monitor your running car, specially if you run a big boost from turbo. To sum it up - wideband o2 for me is a great monitoring tool, that my engine doesn't use at all :)
WOW! You should have way more subs by now. You weren't kidding about the 2%.
This is better than Apex and Lincoln Tech combined, all while sitting on the 🚽!
In appreciation for now, until I enroll. You were drinking a diet Sunkist. See if it has a ingredient called "Aspartame", look it up!
Thanks again!
God bless!!!
I am a molecular biologist. I know all about aspartame.
always remember- “the poison is in the dose”
@@SchrodingersBox
Molecular Biologists, wow, nice title! Me, I'm not the sharpes tool in the shed. When you spoke about the sensors being as witness in a court of law, it reminded me of something else I was currently viewing.
This will be a change of pace from automobiles:
ua-cam.com/video/xU60nNhcXtY/v-deo.html
I'm sure you could appreciate this, as I know most people wouldn't even comprehend it.
Thank you again for all your help!
God bless!!!
"By the time your Subaru gets up to 60, you're already where you need to be... " 😁 I like that!
Great observations! I've been considering getting Autoenginuity myself. I currently use a Bluetooth scanner with my Android Phone. Torque is the paid app with the Torque Scan paid "plug in" in addition. It doesn't include near as many PIDs as Autenginuity, but the O2's, A/F sensors, STFT and LTFT are included. Also MAF, IAT, TPS, MAP, Engine Load , CMPS, CPS, CTS.and includes graphing and custom Gauges. Not bad for an investment of $30-40.
great explanation of those wideband sensors, keep up the good work, you explain things very well. i'll look forward to future videos.
Thanks Frank, glad you enjoy them and I will be releasing more videos soon
Good job on your presentation.....!!! My only comment is....alot of the lesser expensive scanners do not have the ER scale...but even the lower-end scan tools will have Short Term Fuel Trim(STFT). I generally use STFT on diagnosis so that I do not confuse myself with voltage scaling. At 10am I can be scanning a car with O2 sensors, then at 12pm scanning a car with A/F sensors. But, fuel trim is the same with both. The only problem would be with a dampened meter - the reaction time can be slow. I'm fortunate enough to have a VERUS bi-directional scanner at my disposal, so I can isolate O2 readings and graph them in almost "real time". I thought your viewers may enjoy you doing a "fuel trim" vid to show how they can use the scan tool to do essentially the same test you did on this vid. Keep up the good work.
hi, couple of tips, before checking wide band, we need to check if heater circuit is functioning properly to be on safe side, i suggest to test during closed loop. veryinformative, i learned about ER today.
WTF is ER?
Rýán Túçk He is referring to Equivalence Ration which is explained in the video. Briefly, it normalizes the sensor's output to equal 1 if the sensor is in stoichiometric.
It is a great video! I came from the other side, I learned to use lambda values (equivalent ratio) with a wide band bosch sensor when I turbo charged my old audi 80 quattro. (It was a 4 cyl (lol) around 300hp) If you wot the engine in EQ you sould see something around 0.84 at full load if we talking about an engine with injectors at the intake manifold. The direct injected engines are different, they can work on lambda 1 most of the time, even in wot. (soon I watch and understand all your free vids, so you will have an another sub for the other chanel :) thanks for the great content)
Good video, very well presented. You can also look at the heater control and pump cell cycling with a DSO.
I have to say that I thoroughly enjoyed your comments about Subarus and 4cyl cars even though I love Subarus. Thanks for the excellent teaching.
+zracer81 Thanks man... but I bet your opinion about Subarus would change if you ever have to replace a head gasket in one with 180 degree cylinder heads!
Very true. As a hobby I buy Subarus with problems and fix them up and resell them. Headgaskets are a major repair - done about a dozen of them and the easiest way I think is to just pull the engine out. Tried doing it with the engine in the car ended up using more of the f-word than any other tool in my garage.
didn't know you could do them with engine in car. I wouldn't even attempt that. in fact on most cars I find it easier to just pull the engine and ensure my torques are accurate.
+Schrodingers Box What's a 180 degree cylinder head? Is that particular to a specific model or range of models?
Garth Goldberg Subarus often have cylinder heads that are located 180 degrees apart- e.g. the valve covers are across the engine in a straight line from sidewall to sidewall as opposed to the usual 60 degree "V" shaped design
Thanks bunches, Matt! Love your videos...have learned many things.
I love your explanations. One of my car's wide band sensor is showing 0.0 volt on left bank and on the right bank it's fluctuates from 1.5 to 5. I believe the left bank sensor is dead. It's a V8 1UZ FE Toyota engine.
Thanks from Lithuania, i watch yours videos a lot , you the man :)
Lol thanks bro.
Very good videos and well explained. Turned me from enthusiast to DIY.
Ur my favorite sir the way u explain is truly appreciat able
So nice of you!
Thanks for the very good explanation/education. You are a great teacher and I am very grateful.
Great series, that explains it very clearly.
I'm loving it... I'm glad I bumped into your channel... You definitely are a teacher.. Because I totally understand everything you are teaching. And a trick I just learned. To find a vac leak. Just as long as you are careful with a HOT engine. Hahaha. Wow awesome. Thanks... And of course I subscribed👍🏼👍🏼👍🏼👍🏼👍🏼💯💯💯💯💯🥵
Welcome aboard!
Great class Shrodinger!! I worship you insight, man! Just came to mind that a 14.7:1 stochometric ratio is for a classic gasoline free of ethanol, called E0 fuel, but with a nowadays more common grades like E10 is about 14.4:1 and as a lot are E15, having a ratio of about 14.1:1. So, I'm trying to give a headsup, if I'm right.
Congrats on your videos.
Yes other people have indicated that and I have not actually looked into it. It seems reasonable and when I get some time to look into I'll most certainly introduce the concept.
Great video! Additionally, the equivalent ratio es the lambda so if you had included in on your WOT run I'm pretty sure it was around 0.75 to 0.8 where gasoline engines produce more torque. And that value multiplied by 14.7 would give the actual a/f ratio.
Until I saw these videos I didn't know what to look for to tell the difference. At least now I know.
As an aside, when you were talking about dvom's, I remembered a meter I bought nearly twenty years ago. Not only was it able to measure current it could do min-max holds. The meter was a micronta (radio shack) dvom. I still have it but I'd have to see whether it could react fast enough to do everything needed for the test. It was a hundred bucks back then so if it's capable then that makes it pretty advanced for it's time. Looks like I need to dust it off and give it a try.
Thanks Matt, your brilliant, I always wondered why sometimes on some cars produce an equivalence ratio pid and thanks to you i now know.
Thanks mate, kind regards Jay 😊
Great to hear!
Imagine that I drive a 2 cylinder car (2014 Lancia Y 0.9 Twinair turbo gasoline/CNG engine, gotta love Italy). You would go crazy! :) However that car is what brought me to this channel, so lucky me!
Actually, coming from a different region (Europe), I was amazed when I heard about ginormous 6.0 L V8 engines that are so common in the US, the trend here is to have smaller engines (1.0 to 2.0 L) with turbocharging, VVT and all kinds of technology which "squeezes" the hell out of the engine and (theoretically) reduce emissions and maximize efficiency. Most city and smaller cars have actually 3 cylinders here, many with GDI. Also, we have turbocharged Diesel engines, still very popular, which I don't think are that common in the US.
Yes great comment. I have many many many European viewers and I have come to be very familiar that smaller engines are far more common there and I also get asked several times a day by European viewers if I have any videos on diesels (I do not). It’s a totally different culture however I can tell you America is definitely trending to smaller engines- there’s no doubt. But the diesel thing never caught on here. I believe electric cars will by far become more prevalent than diesels ever will here.
thnks my friend, from Peru👍👍👍
thanks. you're a good teacher and you explain very well as well. now I know that my upstream is an A/F and not an O2 sensor thanks to you. I thought that it was an O2 sensor and not responding well and stuck on about 3.5v to 4.5v. even my scan tool showed me the result in mA instead of volt , I was wandering why. many thanks .
Muy buen video very well elaborated, you make me really think outside the box I'm part of the 2% and very proud
Sir, Thank you for your (excellent) class please continue add new classes to your portfolio, that is for us to enjoy and learn
thank you so much sir its been a long time i dont understand the wideband oxygen sensor but now i totally understand because of you sir im so much happy now before only a tradional O2 only i uderstand thank you so much sir.....
Thank you for videos and also for sharing your knowledge. Very useful these explanations! Really, you love what you do and you're doing it very good! Congratulations!
Great job on the video. I would also agree that you have a knack for teaching if you ever end up not working on cars anymore.
THank you for sharing this valuable information!
Anytime!
very interesting stuff, in the industrial electrical world the use MA signals as a standard, they must now be introducing it into the auto world.
thanks for the info my friend...
Great vids and well explained. All the best with your endeavours.
Great job on explaining this and I learned a lot.
Thanks for the thorough explanation on a/f sensors. I will be subscribing to your channel!
Very good explanation
very good video, today I learn so much about this af sensor. thank you man.
Excellent explanation and or class lesson. Thanks for sharing.
***** Thanks bro, glad you found the channel!
Yes excellently done, Thanks for sharing.
Very good lessons,although I couldn’t absorb everything yet,but it’s very helpful,I need to apply in real time,but couldn’t afford to buy a scan tool to do so....
Took me many, many times to learn before it sunk it
Thank you for your quick reply, happy new year...
At min: 17:38 which of the 2 oxigen sensors should show a rich condition at WOT in a 4 cylinder car?
Love you tiny blackboard :) its amazing.
Very informative, great presentation.
cool to see how widebands manage fuel delivery.
Thanks for sharing. Love your channel.