I've been dealing with O2 sensors for over 40 years now. This is a great refresher to get back to the basics. Don't ever skip the basics. Great video lesson.
@@realfixesrealfastpls help. I have a lambda of 1.003 which is normal but my LTFT is -12.67... and my STFT is +-9 what's wrong, every other sensor is reading correctly but I have no catalytic converter. Please help... Is an 06 accord
good question, Fuel trim is a mathematical equation based on pre-engineered calculations (if - then) I would suspect having no cat disturbes the whole equation. @@Delight.AutoCRAFT
Excellent i have been watching your you tube videos since you started makeing them i have been a mechanic 20 plus years and i allways learn something from you thanks again
Thank you so much!! Recently bought a new scanner and when I saw 2.XX volts on one of the oxygen sensors I thought it was defective or not compatible with a 2021 Odyssey since it worked as I was expecting on a 2002 Odyssey. Glad to now know a wide band range is between 0-5V! 💪💪✊
keeps getting better i work mostly on older cars and don't see a lot of the fuel air ratio sensors and have been struggling on my diag of them this made it so simple took camera and reorded this for refrence again thanks so much for the time and hard work
As you say, I found this confusing, in part because of some variance between manufacturers as to how this is reported in the scan tool. I'm told also that the wideband sensors show more changes in current rather than voltage, with current changing to normalize voltage. Is it fair to say that all manufacturers follow a standardized pattern of reporting lambda low being rich, lambda high being lean? Mostly with these new sensors I've been looking to fuel trim to be sure I am getting the direction right.
On a scan tool, Lambda may be recalculated by PCM as a nominal voltage outut .. but high V is lean, low is rich??? I think. (can someone clarify this point). Lambda may also be reported as a mA figure, again with high/increasing mA showing a lean condition, low/decreasing mA showing a rich condition?? That said, with everything there is an exception, and I believe that Honda's PIDs show high/increasing mA to show rich condition (like narrowband) and low/decreasing mA to show lean condition.
Hi, my car kia stonic 2018 1.6 crdi had new dpf,turbo,egr,intake manifold and o2 sensors, and it's still running rich , showing 0.9v at idle and when cruising at constant speed stays at 0.4-0.5v, when giving it throttle it goes down to 0.1-0.2 , when releasing the gas pedal goes as high as 1.4v , running i guess as it regenerates the dpf every 130 miles and has a thin layer of soot inside exhaust tailpipe. Any suggestion what could be wrong with it, kia don't seem to know what's wrong with it . Thank you Not throwing any codes.
@@PhillyDee215 cats were clogged didn’t know what was going on for months losing pressure and all sorts of issues with power i did a vacuum test and it showed low vacuum did some research and cut off one of the cats and straight piped it and its been running great just gotta save for new ones
@@Ty-ta224 yeah definitely try to get OEM cats or a premium brand that guarantees manufacturers specs bc if not you'll keep getting a check engine light and ultimately end up paying twice
I'm trying to figure it out too. My understanding. Assuming the range is 1-5v, I would think it would be 2.5v? I'm new to scan tools so hopefully someone can confirm or deny this.
My scanner shows 1.28V constant regardless of the car condition for downstream (2 wire) O2 sensor. Remains the same even if the engine is idle or rev. running or park, warm up or cold. I removed the connector and checked the voltage of the signal wire, 4.4V is coming from ECU. Is this voltage normal or something wrong in the ECU?
You dont say what your vehicle is, but as always there are engineering variations occasionally in how the sensors are designed and calibrated to work. If it's a downstream sensor, then it's a narrowband (not yet heard of a wideband downstream sensor). If it's a narrowband with a working CAT, you expect a fairly constant V output. If we are talking about a 1V range then you'd expect a fairly constant ).45 to arond .6V output, but over the long terms (many seconds, to minutes). It may slowly fluctuate in that range, or even go quite lean or rich depending on driving condition inputs (accel, decel) and how well the CAT is coping with cleaning exhaust and capturing O2. In short, constant output (roughly) and slow fluctuations. Your sensor appears to work with a 4.4V bias voltage. The ECM uses a bias V to test/check whether the sensor is shorted or open circuit ... ie open circuit would have a 4.4V signal when the ECM is programmed to see something else = Fault. Short circuit may have 0V signal when ECM is programmed to see something else = Fault. A normal signal in your case appears to be around 1.2V, but should still go leaner on decel downhill, and richer on heavy accel, WOT. Try it and see.
For example titanium narrow band sensor gives voltage between 0-5v it still goes up & down for whole 5 volt range so part "what if range was the same" is not accurate.
They read like that because its easier to see the change in milliamps going up or down rather than volts. Because the voltage wouldnt have significant mivement!
My both my Second sensors b1b2 and b2s2 Say 99,2% short term.. Should it be like that? My fuel enconomy meter shows that the more I put the throttle down the less I burn.. When I let the throttle off I get maximum fuel usage.. When I floor it I get regular fuel ecomomy. Wtf? The car drinks more fuel. It should be 0,7liter now it's 1,2liter. don't know in gallons. But it's pretty mutch one third more then normal.. Sorry for bad language.. Im from sweden.
I have ran into one of the sensors are faulty replaced it. Verify the repair the new sensor works more efficiently than the old ones ( they are slow. ) ECM kicks out the code for the other sensor
@@1magnit I’m really not sure if you got value for your educational expenses, only you can figure that out. But last I checked ZrO2 reacts to oxygen differentials and not hydrocarbons. But I am always willing to learn so if you have something to show otherwise, I’m willing to hear you out.
O2 sensors have a (usually) platinum bulb with an orifice connecting the inside of this bulb to the outside atmosphere. The reading is generated because the delta between the oxygen content of the exhaust in the system and the oxygen content in the outside atmosphere causes a difference in the conductivity of the platinum. Or at least that's what I was taught. My college also taught that ad hominem attacks were a likely indication that a person does not fully understand their subject matter. When debating chemistry, it's better to challenge positions rather than people.
ErictheCarGuy was right about Realfixesrealfast INTELLECTUAL Realfixesrealfast Tutorial amazing thank you for sharing what you know with us. Take care and have a great day INTELLECTUAL Realfixesrealfast From Nick Ayivor from London England UK 🇬🇧
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So many videos showing incorrect info about lambda sensors. This video is correct. Well done 👏
I've been dealing with O2 sensors for over 40 years now. This is a great refresher to get back to the basics. Don't ever skip the basics. Great video lesson.
Thanks, I appreciate your comments. Yes... the basic usually solve problems. That's what I always taught to my students.
@@realfixesrealfastpls help. I have a lambda of 1.003 which is normal but my LTFT is -12.67... and my STFT is +-9 what's wrong, every other sensor is reading correctly but I have no catalytic converter. Please help... Is an 06 accord
good question, Fuel trim is a mathematical equation based on pre-engineered calculations (if - then) I would suspect having no cat disturbes the whole equation. @@Delight.AutoCRAFT
Excellent i have been watching your you tube videos since you started makeing them i have been a mechanic 20 plus years and i allways learn something from you thanks again
Thank you so much!! Recently bought a new scanner and when I saw 2.XX volts on one of the oxygen sensors I thought it was defective or not compatible with a 2021 Odyssey since it worked as I was expecting on a 2002 Odyssey. Glad to now know a wide band range is between 0-5V! 💪💪✊
32yrs old and now learning this in greater details.;
keeps getting better i work mostly on older cars and don't see a lot of the fuel air ratio sensors and have been struggling on my diag of them this made it so simple took camera and reorded this for refrence again thanks so much for the time and hard work
If you have UA-cam Premium, just download this video and you can have access to it with no internet/whenever on your phone (:
Super tutorial ! It answered lots of questions / cleared up the confusion . Thanks !!
🏹🎯
The best class I have had this last time, is always a great advantage and source of knowledge, my cordial greetings, thank you
Great to see you still active, thanks for sharing your learning. Keep on keeping on.
Stay gold.
OUTSTANDING video!! Well explained. Thanks for posting!
Helped me a lot I’m an old dog trying to learn new tricks
As you say, I found this confusing, in part because of some variance between manufacturers as to how this is reported in the scan tool. I'm told also that the wideband sensors show more changes in current rather than voltage, with current changing to normalize voltage. Is it fair to say that all manufacturers follow a standardized pattern of reporting lambda low being rich, lambda high being lean? Mostly with these new sensors I've been looking to fuel trim to be sure I am getting the direction right.
Muy buen video y exelente explicación
Gracias por está valiosa información Amigo👍⭐⭐⭐⭐⭐
An excellent explanation 4 beginners
WOW ! ! Already at 2:00 I learned something I was wondering about .
I'm glad it helped you. Thanks for responding
On a scan tool, Lambda may be recalculated by PCM as a nominal voltage outut .. but high V is lean, low is rich??? I think. (can someone clarify this point). Lambda may also be reported as a mA figure, again with high/increasing mA showing a lean condition, low/decreasing mA showing a rich condition?? That said, with everything there is an exception, and I believe that Honda's PIDs show high/increasing mA to show rich condition (like narrowband) and low/decreasing mA to show lean condition.
Thank you for your sharing of information!
Great as always thanks for sharing your knowledge
What if you have 0V after cleaning carb cleaner in ultrasonic cleaner? Now the car won't go past 3000RPM,did I break it ?
yep. never stop learning.
Hope you ARE all well
What other resources do you recommend to learn more?
Thanks Legend, This will help me alot with my bachelor degree
Great explanation. Thank you
What is a good way to identify both sensors thru a part number.
Narrow band have 4 wires, two for the heater and two for the sensor. Wide band have 6 wires.
With Post Cat Narrow band sensors, by adding a spacer, does that change the Voltage O/P, and if so by how much?
Thanks for sharing sir
Very nice informative video
Wideband covers like 13:5 to 16:5 to 1 ratios.
Narrowband is like 14.2:1 to 15.1:1 ratio
My lights still on after i replaced OEM b1s1 2349042, b1s2 2349047, camry 2002.
Are these widebands?? Theyre are a/f ratio sensors....
Plz
Great points made simple!
Hi, my car kia stonic 2018 1.6 crdi had new dpf,turbo,egr,intake manifold and o2 sensors, and it's still running rich , showing 0.9v at idle and when cruising at constant speed stays at 0.4-0.5v, when giving it throttle it goes down to 0.1-0.2 , when releasing the gas pedal goes as high as 1.4v , running i guess as it regenerates the dpf every 130 miles and has a thin layer of soot inside exhaust tailpipe. Any suggestion what could be wrong with it, kia don't seem to know what's wrong with it .
Thank you
Not throwing any codes.
any update??
Awesome video! Thanks!
Glad, TO see YOU sir
🤦♂️The worst thing I see in the Auto industry is when Techs think an Oxygen sensor will fix a bad CATALYTIC CONVERTER
Happened to me
@@Ty-ta224 what happened....
@@PhillyDee215 cats were clogged didn’t know what was going on for months losing pressure and all sorts of issues with power i did a vacuum test and it showed low vacuum did some research and cut off one of the cats and straight piped it and its been running great just gotta save for new ones
@@Ty-ta224 yeah definitely try to get OEM cats or a premium brand that guarantees manufacturers specs bc if not you'll keep getting a check engine light and ultimately end up paying twice
Lol no
Good video but what is the normal range voltage for a wideband? I'm sure it's not good if it's pegged at 5 volts for example.
That's what I'd like to know.
I'm trying to figure it out too. My understanding. Assuming the range is 1-5v, I would think it would be 2.5v? I'm new to scan tools so hopefully someone can confirm or deny this.
From what I've seen on other videos, it's manufacturer specific. Another useful unit is Equivalence Ratio (ER).
In my car manual indicates that if the lambda is between 0.98 and 1.02 at idle and T>80C is considered that passed the test.
My scanner shows 1.28V constant regardless of the car condition for downstream (2 wire) O2 sensor. Remains the same even if the engine is idle or rev. running or park, warm up or cold. I removed the connector and checked the voltage of the signal wire, 4.4V is coming from ECU. Is this voltage normal or something wrong in the ECU?
sounds pretty normal to me, if it were the upstream it would indicate a fuel trim in balance
You dont say what your vehicle is, but as always there are engineering variations occasionally in how the sensors are designed and calibrated to work. If it's a downstream sensor, then it's a narrowband (not yet heard of a wideband downstream sensor). If it's a narrowband with a working CAT, you expect a fairly constant V output. If we are talking about a 1V range then you'd expect a fairly constant ).45 to arond .6V output, but over the long terms (many seconds, to minutes). It may slowly fluctuate in that range, or even go quite lean or rich depending on driving condition inputs (accel, decel) and how well the CAT is coping with cleaning exhaust and capturing O2. In short, constant output (roughly) and slow fluctuations.
Your sensor appears to work with a 4.4V bias voltage. The ECM uses a bias V to test/check whether the sensor is shorted or open circuit ... ie open circuit would have a 4.4V signal when the ECM is programmed to see something else = Fault. Short circuit may have 0V signal when ECM is programmed to see something else = Fault. A normal signal in your case appears to be around 1.2V, but should still go leaner on decel downhill, and richer on heavy accel, WOT. Try it and see.
For example titanium narrow band sensor gives voltage between 0-5v it still goes up & down for whole 5 volt range so part "what if range was the same" is not accurate.
👍 Nice, clear & accurate :)
The out put for wideband should be AMPER not VOLTAGE isn't it or i'm wrong.
good question, some manufacturers do reference amps instead of volts. I will address this in the follow up video, stay tuned
Have a bunch of "Wide Range" B1S1 O2 Sensor parameters (impedance, heater, ...) but NO VOLTAGE parameter. Where is it?
Thank you
Thank you!
Good diag keep it up!
My wideband is in milli-amps.
They read like that because its easier to see the change in milliamps going up or down rather than volts. Because the voltage wouldnt have significant mivement!
My both my Second sensors b1b2 and b2s2 Say 99,2% short term.. Should it be like that? My fuel enconomy meter shows that the more I put the throttle down the less I burn.. When I let the throttle off I get maximum fuel usage.. When I floor it I get regular fuel ecomomy. Wtf? The car drinks more fuel. It should be 0,7liter now it's 1,2liter. don't know in gallons. But it's pretty mutch one third more then normal.. Sorry for bad language.. Im from sweden.
I have ran into one of the sensors are faulty replaced it. Verify the repair the new sensor works more efficiently than the old ones ( they are slow. ) ECM kicks out the code for the other sensor
you are correct, good observation. There are many possibilities.These systems are not simple
top
so rich voltage signal goes up as the oxygen goes up🤔🤔🤔🤔🤔🤔🤔🤔i thought it was backwards
Oxygen sensors don't sense oxygen, they sense an excess of fuel and also a lack of oxygen.
There is no part of a oxygen sensor that is capable of detecting hydrocarbons, it can only detect oxygen.
@@larryreno8293 If you'd been to university and studied chemistry, you'd know otherwise.
@@1magnit I’m really not sure if you got value for your educational expenses, only you can figure that out. But last I checked ZrO2 reacts to oxygen differentials and not hydrocarbons. But I am always willing to learn so if you have something to show otherwise, I’m willing to hear you out.
@@larryreno8293 It's all on my channel
O2 sensors have a (usually) platinum bulb with an orifice connecting the inside of this bulb to the outside atmosphere. The reading is generated because the delta between the oxygen content of the exhaust in the system and the oxygen content in the outside atmosphere causes a difference in the conductivity of the platinum. Or at least that's what I was taught. My college also taught that ad hominem attacks were a likely indication that a person does not fully understand their subject matter. When debating chemistry, it's better to challenge positions rather than people.
I understand nothing!!!
ErictheCarGuy was right about Realfixesrealfast
INTELLECTUAL Realfixesrealfast
Tutorial amazing thank you for sharing what you know with us. Take care and have a great day
INTELLECTUAL Realfixesrealfast
From Nick Ayivor from London England UK 🇬🇧
Thank you