I'm an OSHA trainer/ instructor I've heard lots of trainings in my time, this is one of the best detailed well said instructions/explanations I've ever heard if your not in the field of helping others you should be I can tell by your presentation you make one hell of a guy to do so your voice carries perfectly your deminer is calm dude you got a gift thank you for helping all us ... very very impressed.
Found my problem of a dirty MAF sensor... used MAF cleaner to clean the sensor two tiny silver wires that were heavy coated with dirt, clear the code, no problems, truck run great 👍...
Common sense is to replace or clean any cheap [arts first: plugs, coils, injectors, clean MAF sensor, replace TPS (not worth trying to clean), replace air filter, check for cracks or leaks. THEN get help from a competent mobole mechanic who knows the patterns for an old car like yours... An old Corolla will be very well known to mechanics.
Solved my p0174 & p0171 with 4 cans of Lucas injector cleaner. Took awhile to go through 4 tanks but light is off now. Checked by a mechanic and he said it's not throwing those codes anymore.
I have the same code for my corolla 2003 !! I take it to toyota dealer and they want to charge me 1100 dls for change the manifold ( they crazie ).. the word part is they told me that they not sure that fix my problem
Turns out it wasn't my air filter. The check engine light would sometimes go away on its own. Even after replacing both oxygen sensors, MAF sensor, headcover gasket, and smoke testing, air filter, the code kept coming back. I later discovered that my fuel injectors were in pretty rough shape. The housings were cracked, but visually nothing was clogged. I didn't really have a way of testing them, but my '02 corolla is at 230k miles, and believe they've never been replaced. So I've replaced the fuel injectors, and the car runs and accelerates a lot better now; it even starts up faster and possibly better mileage. It also has cleared the P0171 code, but I will have to drive the car a bit longer to determine it. If anyone is still having this code, I think it's worth replacing the fuel injectors. Just be careful working around gasoline, and make sure to get Denso OEM injectors. They do run a bit expensive 130$, but you won't have to worry about getting the O-rings.
I replaced my 2002 4Runner with Beck & Arnley fuel injectors. They’re the same oem fuel injectors I believe just remanufactured? Don’t quote me on that but they reuse the Aisin oem fuel injectors 100%
Great video thanks for the help on mine it was the 4 injectors after replacing everything else i wished i could have found your channel before i did all that thanks again God bless
A bad EVAP system can also create a lean code. Disconnected the EVAP purge solenoid and drivability greatly improved and no more lean code. Yes, EVAP code was still there.
Just bought a 2004 Toyota Camry LE V6 today and I’ve got to tell you this video has saved my life. I’m a noobie mechanic but I work on everything I buy myself and this was amazing thank you!!
Great post I got a p0171 lean code so I will check my fuel pressure before I spend money on parts I dont need ps why would anyone take a beater car to the dealer lol they will charge you more than the car is worth it self lmao
I'm amazed at the many attempts to fix this that had no effect. Guess you go with the easiest things/cheapest things first, so no one wanted to dive into the fuel pump as a possibility . Good video.
It's because the fuel system is continuously wearing down but it is not a material problem functionally until the engine throws a code at around 200-300k. Meanwhile, you lost gas mileage without knowing it for about 100-200k of driving.
All the banter .. my rule of being a poor kid trying to diag .. start with the cheap-free solves first .. clean the MAF .. change the air filter, check the fuel pressure .. didn’t do the trick well at least you can eliminate that and you probably needed to do it anyway .. work your way up the cost/maintenance ladder .. I dunno maybe I’m stupid
How do these idiots get away with it ? You did way over $ 1000.00 of work and the car does the EXACT same thing ! I would only pay DEALER NET COST on the parts , NO LABOR ! Or they get sued in small claims court ! The question , when you get a work order to approve is " will it fix the car " ? Remember , they are " experts " !
Bill Smith I agree. It is frustrating seeing what happens sometimes at the dealerships. I know there are good ones out there but there are also times that people get taken.
AVRAHAM BREA the intake manifold gasket was changed during the head gasket job the dealer did. As much as I have heard that it is a common failure on these engines none of the ones that I have run into have had intake gaskets leaking.
I have the same code in my Toyota Yaris sedan 1.5 2009 and the fuel pressure is 37 PIS so that's mean the pump or fuel filter,or pressure regulator is the problem.I will replace all because it too much work check every part with the time
I had the exact same problem I put in a new 02 sensor lasted about 4 months or so then the same code came up opened the air filter box the thing was not even connected lose in the box hooked it back up runs perfect now.
woww my P0171 came 1 day after I installed a new air filter, so you say in your case was the wrong installation of the air filter ? or something else ?
My 07 Corolla is in the shop for the THIRD time right now, 7 days total and these idiots still cannot figure this out. They threw on parts I didn't need and said that was the problem. Had this same issue before a year ago that 5 or 6 shops couldn't fix either, ended up going to the stealership, who fixed in one day. So annoying! >:(
Great video. Fuel pump is my problem as well. P0171 code, lean bank 1 (4 cylinder only has bank 1). 2016 Turbo Dart. looked high and low for vacuum leaks. This video confirmed my fuel pump suspicion. I replaced the original fuel pump with a Delphi unit 4 months ago. To verify the new pump is at fault I had to rig up pressure gauge in the fuel line. No pressure test port from the factory. And what do you know, 37 psi when should be 58 psi, and drops to 0 when engine is shut off.
Great informational on the lean fuel code issues! You hit every bullet point dead center. This is the first video Ive seen of yours, but can guarantee I'll be looking through more for help along the way. I drive a 1st gen Expedition 4x4, and have same lean code. My issue is the front wheel hubs bring more unregulated air into the system. Great video and look forward to learning some more wisdom for Your Car Guy DR! Keep us Rollin 🛞
p0171 code is so hard lols i still got this code for 3 months now i took it to MIdaS and they clean my MAF sensor only and the engine light came back on an hour later lols... paid them 100 bucks for cleaning the Maf sensor for nothing... they dont know whats wrong with it lols...
I'm gonna put in work on an 07 Corolla and this code is one of them beside the p0420 which is a bad cat but. I'm hoping it's the maf or 02 sensor. But thank you for this video helped a lot.
I’m going to try this on my 350z I have had that code for a couple months now and today heading home from work it dropped rpms and didn’t want to a accelerate when I step on the gas.
Some good info, and insight, on this problem. Thank you! My 02 Tacoma started acting up last night (Check engine light came on....then it didnt want to maintain idle, and would fall off flat at WOT on the way home). Luckily, it's a manual trans, or AAA would have encompassed the rest of my evening. Interestingly, I had JUST dumped a bottle of Dry Gas (with injector cleaner), in it yesterday because of all the temperature swings, and rain we've had on the East Coast, lately. Hrrrmm Limped it home, and pulled the engine codes : PO171, and PO136. I'll start with the O2 sensor, check for vacuum leaks, and move on from there. If fuel pressure is at spec, and the injectors are all at their respective factory specs for resistance, do you think a clogged CAT could contribute to this issue in any conceivable way? Thanks for any reply, and your time. "Liked, and subbed." 👍
If it just started happening after the dry gas was added I would try to get to a second tank of fuel and see if it clears up. Clogged catalytic converters are pretty rare.
That’s right these car dealership can take your money and they still didn’t fix the problem you should sue and get your money back they are money hungry I have the same problem and things you don’t need and you only going because your check engine light on I will never do that again try and fine the right mechanic that knows what he’s doing or ask a good friend where they take there car that they can recommend never go to a car dealership.......
@Your Car Guy DR. i have a 2003 Camry with 540k miles my first ever car still running like a Gem. after replacing the Evap Canister i noticed i was gettting the P0171 checked ALL the air intake sensors hoses etc. .. issue Fuel pump. thanks for helping GPA car get back on thr ROAD
Play previously had a po171 code just recently within a month. It's running very underpowered hard going up hills etc.. About 9 months ago I was driving on the highway and the car crashed right out just stalled right out. I don't know if the fuel filter was checked and I know there are one in the same mounted on top of the fuel pump that was changed over so the new fuel pump would also include the new fuel filter especially on that car is that correct? Can anyone tell me this otherwise I'm going to have to die back in and replace the fuel filter if that's the problem
It depends on if you bought a complete fuel pump assembly that included the filter and pressure regulator or if they just put a new pump in the original assembly.
I have that exact issue. I was trying to fix it for five months and changed o2 sensors and Maf sensor with tune up. I don't see your video on the fuel pump! I need to replace the whole kit. Do you have that video? Thank you very much!
I did the following and still running lean *Changed oxygen sensors twice. *Changed fuel pump *Clean Maf Sensor *Intake manifold *Welded a crack in the exhaust manifold. What am I missing?
It is possible you have a bad MAF sensor. I would verify fuel psi and inspect for vacuum leaks. One or more faulty or plugged fuel injectors could also cause an issue.
My Toyota V6 was doing same thing replaced everything MAF, Oxygen Sensors, throttle disassembly and cleaning to dealership no avail only thing that worked was several aggressive treatments with Cheveron fuel injector cleaner just got it to pass smog. Might have to drop tank.
Very informative. Thanks. The fact the dealer just threw parts at it is pretty disheartening and disgusting. Of course they charged for all that unneeded work.
Thanks for the vid i have a feeling my 08 xb may have a fuel pump issue got the car with 180,000 might have to check the pump a lot of the parts on this car seem original🤔🤔🤔
Injectors like other parts wear out over time. They can still be working and not performing as well as they should. In this case the worn injectors were causing a rough idle and lowered performance. New injectors can help return an engine to like new performance.
haha the dealer just shotgun parts in attempt to fix it. i work at lexus and im still scratching my head i have an 2003 matrix 1zzfe. fuel pressure check is next followed by smoke the engine to see if i can find any vacuum leak. i already replaced intake manifold gasket per service bulletin. car was fine before i put in new clutch n flywheel. no kinked lines from removing subframe and my wiring grounds are solid.
It depends on the climate that you are in. In colder weather it is good to give the engine just a bit of time to get the oil warm and flowing properly.
Running in low fuel regularly leads to fuel filter issues...because the whole unit is built into the tank..it's best not to dip too low past the quater mark
Corollas are known for having this code 00-10. I already owned 2 corollas one 03,06 and they both had that issue. My experiences were that the code only came up when the weather got cold. Most of the times check engine light would turn off itself by the end of the day. The mainfold gasket is the main reason that causes this.
Intake manifold or exhaust manifold? I just replaced both so I couldn’t pin point which one it was however I believe in my case it was the exhaust manifold
The reality is that the fuel delivery system is experiencing continuous wear but the computer cutoff for when Toyota wants the customer to address it is much later than when the condition originally occurs. Clogging of the injectors can begin as early as 60-100k but nobody drives with an OBD scanner monitoring longitudinally the change in long term fuel trim. The gasket would create a lean vacuum leak. In that case the engine calls for more fuel at idle and decreases the extra demanded amount as the throttle body opens The fuel system degradation would cause a lean code after the engine is pushed. Meaning LTFT increases with more acceleration.
I have a 2000 Corolla... replace all 4 injectors as a good start and new NGK platinum plugs with 4 coils. Routine stuff and any 'mobile mechanic' can do it cheap.... you buy the correct parts and hire him to install them!
How were you sure it was the injectors? My 2000 is at 180k so it could be that, but I don't like throwing parts at things. That's how yo incorrectly replace head gaskets, as was mentioned.
@@girohead I replaced injectors at about 220K miles at the advice of a skilled mobile mechanic (worked on racing cycles and cars) who has a sophisticated scanner. A 'miss' I resolved this year with 1 'ignition coil wire' for about $70 and 2 minutes time ...
The fuel pressure can be affected by several things. First if the fuel filter is plugged. Next if the pickup screen is plugged. Next would be the fuel pressure regulator. If all of those are fine and the pump isn’t producing adequate pressure or volume then the pump needs to be replaced.
Thanks for the great tips, I'm working on this issue on a 04 Camry at the moment went through all the minor steps, fuel pressure is the next move to verify it's in the right range.
I had an issue where my pump assembky filter was clogged. Weeks prior i had just replace the injectors thinking that was the issue. I then replaced fuel pump assembly but it already clogged my new injectors. Now, thinking, oglh my i jectors are new, thats not my issue, i replaced so many parts on my car chasing an issue. Month/half later, i get code p016c. Which faulty or clogged injectors can trigger. I decided to reolace them again, issue gone. i spent 1.7k in parts and the injectors were the problem the entire time 😂 😢😢😢😢😢 Cars runs like new tho ❤ ***Dont ask me for the list of parts i replaced*** 😬
p0171 is set when the reading from the Oxygen Sensor (O2 sensor) is out of specs and too lean. On an in-line four cylinder there is only one bank this bank one. A v series engine would have 2 banks and thus could set a code for too lean on bank two or bank one. It is a mistake to blame the oxygen sensor for telling you that something is wrong in the engine. They replace the oxygen sensor and then still have the issue. Yes there are times that the oxygen sensor fails. Usually a failed sensor will give other codes. It is always best to diagnose and not just throw parts at a car.
The p0172 is for the system being too rich, in other words too much fuel for the amount of air. This can be caused by an injector that is leaking or a restriction in the intake system (plugged air filter etc)
Well I do have this code but I don't think it has anything to do with the fuel pump or fuel filter because I replaced both of them twice within 3 months. But the code was actually reading p0340. Not a camshaft position sensor. I don't care what anybody says. That is a bad fuel pump. Because even after I replaced the camshaft sensor with that code it didn't start. It was a fuel pump. It's common sense if you don't hear the fuel pump buzz. It's bad. My car has been having trouble starting like as if the fuel pump was bad. My car has had a fuel system problem even before the fuel pump went out and ever since I replaced the fuel pump fuel filter the gas cap p0440 And the O2 sensors p0171. The issue is still happening. The engine hesitates to start due to lack of fuel. It's not the spark plugs or air. I know that for a fact. Like I said my car has had a fuel delivery system for a while now. I've been replacing a different part each month. I'm really hoping that it's not a bad timing chain because that can cause a car to have these exact issues as well. Most of the time when my car starts it starts right away but it has like a 1 or 2-second delay. But still starts right away. P0171 bank 1 running too lean Can cause a car to stall hesitate And hesitate to go up a hill or from a complete stop. And most definitely feel like the transmission is sifting hard. My car has a lot of issues but I'm starting to think That the po171 and p0440 Is a blown head gasket because it's leaking oil. That's the only other thing I can think of besides a bad timing chain or a bad fuel injector. But I hooked up three different scan tooland 1 says PO171 bank 1 running lean. And the other scan tool says P0171 O2 sensor heater circuit malfunction. And the 3rd one say p0440 and p0171. Large Evap leak and bank 1 running lean. And no seafoam does not work. That is a bunch of crap. It only made things worse. Trust me and those fuel injector cleaners don't work either or the fuel system cleaners. Problem with the fuel system. None of those feel additives are going to work. Trust me, it's common sense. Tired of wasting money. Trying to figure out what the issue is. But you mentioned head gasket leak and I think that is the only thing that it could be besides a timing chain. Because The engine is leaking oil. And it's leaking onto the exhaust causing the car to sting under the car, not under the hood. So if my car is leaking oil it could very much be a head gasket leak and can leak oil on other metal parts including the timing chain. You are definitely right about people not checking for fuel pressure, but people also don't check the timing chain that has a lot to do with it too. But I know for a fact it's not the fuel pump on my car or the fuel filter cuz I replace those things twice.
Hi there. I got the same diagnostic. Because i think a mecánic took the second heater core out without my permittion. I only have one heater core which heats in cold weather. Do you think is that the problem. He also change my maf sensor and this issue started. Reads code P0300 that im having issues with my maf sensor now. But know they ran another diagnostic. 2 weeks after maf sensor didn't show. But im getting a most likely manifold gasket. Auto parts told me you might have a vacuum leak. Could it be Because my reservoir container underneath i have a leak?
hammer yt I don’t have a video on a p0172 but it basically means you are getting too much fuel for the given amount of air. A leaking injector can cause this. It can also be caused by a faulty mass air sensor, plugged air filter or even a bad spark plug or coil.
I would take a look at the seals at the bottom of the injectors and make sure one of those isn’t allowing some air to pass. Otherwise remember that this code is caused by either too much air or not enough fuel.
I got a 2003 toyota matrix, when cold it start right up, but after engine got warm and try to turn it back on it will take a lot of time to get it run, so it might be that i need a fuel pump?
my Avalon 02 had same code to lean, checked lines good, but car only turned on to a bogle off. then i removed the air filter and car turned on so just got a new engine air filter in there and its all good now.14$
Running rich can be caused by a faulty mass flow sensor, a leaking or stuck open injector, a stuck fuel psi regulator, low compression in one or more cylinders or even loss of spark in a cylinder.
How can i fix a p0172 problem on a 99 toyota tacoma 3.4 v6. Any suggestions please comment i already replaced coils, spark plug wires and spark plugs and code still pops up. Please comment below. Thanks for the help in advance.
I'm an OSHA trainer/ instructor I've heard lots of trainings in my time, this is one of the best detailed well said instructions/explanations I've ever heard if your not in the field of helping others you should be I can tell by your presentation you make one hell of a guy to do so your voice carries perfectly your deminer is calm dude you got a gift thank you for helping all us ... very very impressed.
Thank you. I appreciate your kind words.
@@YourCarGuyDR very welcome!
If you want to monitize utube and commercials
@@MrRusell86 but its my car not his car, you're wrong
Lol osha trainer here and I agree
Found my problem of a dirty MAF sensor... used MAF cleaner to clean the sensor two tiny silver wires that were heavy coated with dirt, clear the code, no problems, truck run great 👍...
Common sense is to replace or clean any cheap [arts first: plugs, coils, injectors, clean MAF sensor, replace TPS (not worth trying to clean), replace air filter, check for cracks or leaks. THEN get help from a competent mobole mechanic who knows the patterns for an old car like yours... An old Corolla will be very well known to mechanics.
@@YouDontKnowMe210tx MAF sensor cleaner. Can’t do much else, they’re fragile
Solved my p0174 & p0171 with 4 cans of Lucas injector cleaner. Took awhile to go through 4 tanks but light is off now. Checked by a mechanic and he said it's not throwing those codes anymore.
Wow! bet they got soaked at the dealership for the head gasket job that they didn't even need!
jlc7300 yes they did.
Yeah 4 real! I'd be pissed.
I have the same code for my corolla 2003 !! I take it to toyota dealer and they want to charge me 1100 dls for change the manifold ( they crazie ).. the word part is they told me that they not sure that fix my problem
That's a crime😥.. they could hv done a Compression test instead of removing the Head and Still not solving the problem
Sounds like a very dishonest dealership (is that redundant?). Simple tests would have shown a blown head gasket.
Turns out it wasn't my air filter. The check engine light would sometimes go away on its own. Even after replacing both oxygen sensors, MAF sensor, headcover gasket, and smoke testing, air filter, the code kept coming back. I later discovered that my fuel injectors were in pretty rough shape. The housings were cracked, but visually nothing was clogged. I didn't really have a way of testing them, but my '02 corolla is at 230k miles, and believe they've never been replaced. So I've replaced the fuel injectors, and the car runs and accelerates a lot better now; it even starts up faster and possibly better mileage. It also has cleared the P0171 code, but I will have to drive the car a bit longer to determine it. If anyone is still having this code, I think it's worth replacing the fuel injectors. Just be careful working around gasoline, and make sure to get Denso OEM injectors. They do run a bit expensive 130$, but you won't have to worry about getting the O-rings.
I replaced my 2002 4Runner with Beck & Arnley fuel injectors. They’re the same oem fuel injectors I believe just remanufactured? Don’t quote me on that but they reuse the Aisin oem fuel injectors 100%
Where did you buy them?
Great video thanks for the help on mine it was the 4 injectors after replacing everything else i wished i could have found your channel before i did all that thanks again God bless
A bad EVAP system can also create a lean code. Disconnected the EVAP purge solenoid and drivability greatly improved and no more lean code. Yes, EVAP code was still there.
Wait you Disconnected it and then connected it back on or ?….
How did the car start when you disconnected the purge valve ? Just curious
Yeal my old man 2006 Mazda 6 have struck open purge vale make that code before .
Just bought a 2004 Toyota Camry LE V6 today and I’ve got to tell you this video has saved my life. I’m a noobie mechanic but I work on everything I buy myself and this was amazing thank you!!
Luckily My Fuel Pump was $130 with everything assembled in One 🙌🏽💯🙏🏽👏🏽
I hate modern cars. PART SWAPPING HELL $$$$.
Great post I got a p0171 lean code so I will check my fuel pressure before I spend money on parts I dont need ps why would anyone take a beater car to the dealer lol they will charge you more than the car is worth it self lmao
a trick : you can watch series at Flixzone. Been using it for watching loads of movies recently.
@Orion Sonny definitely, I've been watching on Flixzone} for months myself :)
@Orion Sonny Definitely, I've been watching on Flixzone} for months myself :)
@Orion Sonny Yea, have been using flixzone} for since november myself :D
I'm amazed at the many attempts to fix this that had no effect. Guess you go with the easiest things/cheapest things first, so no one wanted to dive into the fuel pump as a possibility . Good video.
It's because the fuel system is continuously wearing down but it is not a material problem functionally until the engine throws a code at around 200-300k. Meanwhile, you lost gas mileage without knowing it for about 100-200k of driving.
Thank sir
My Lord you are outstanding 🙌 so precise and perfect on all the info THANK YOU for your efforts in helping all of us!!!
All the banter .. my rule of being a poor kid trying to diag .. start with the cheap-free solves first .. clean the MAF .. change the air filter, check the fuel pressure .. didn’t do the trick well at least you can eliminate that and you probably needed to do it anyway .. work your way up the cost/maintenance ladder .. I dunno maybe I’m stupid
This is my method as well. It's better than starting with a full engine replacement.
Injector , fuel pump and regulator. Oe injectors
extremely helpful, have a 00 Tacoma and just got a 171 code, yay...
Wow! Very detailed, informative, professional, and awesome insight. Great presentation buddy.
How do these idiots get away with it ? You did way over $ 1000.00 of work and the car does the EXACT same thing ! I would only pay DEALER NET COST on the parts , NO LABOR ! Or they get sued in small claims court ! The question , when you get a work order to approve is " will it fix the car " ? Remember , they are " experts " !
Bill Smith I agree. It is frustrating seeing what happens sometimes at the dealerships. I know there are good ones out there but there are also times that people get taken.
Greatest training video I've ever seen. You go through all the issues it could be and the not wanting to start is the issue I have. Thank you!
No mention of intake manifold gasket those are pretty common on these
AVRAHAM BREA the intake manifold gasket was changed during the head gasket job the dealer did. As much as I have heard that it is a common failure on these engines none of the ones that I have run into have had intake gaskets leaking.
Be suspicious of the new cars with plastic intake manifolds.
I subscribed and liked. Good video. I will check my fuel pressure, and see what's up. :)
I have the same code in my Toyota Yaris sedan 1.5 2009 and the fuel pressure is 37 PIS so that's mean the pump or fuel filter,or pressure regulator is the problem.I will replace all because it too much work check every part with the time
lmao i didnt install my air filter properly so that fixed it
ouch did check engine light came back
@@johnclassified36 nope cleared it and now its gone
I had the exact same problem I put in a new 02 sensor lasted about 4 months or so then the same code came up opened the air filter box the thing was not even connected lose in the box hooked it back up runs perfect now.
woww my P0171 came 1 day after I installed a new air filter, so you say in your case was the wrong installation of the air filter ? or something else ?
Quick and down to the point awesome video guys thank you for posting
This was a informative video but losing fuel pressure shouldn't have anything to do with dirty injectors. O
My 07 Corolla is in the shop for the THIRD time right now, 7 days total and these idiots still cannot figure this out. They threw on parts I didn't need and said that was the problem. Had this same issue before a year ago that 5 or 6 shops couldn't fix either, ended up going to the stealership, who fixed in one day. So annoying! >:(
Great video. Fuel pump is my problem as well. P0171 code, lean bank 1 (4 cylinder only has bank 1). 2016 Turbo Dart. looked high and low for vacuum leaks. This video confirmed my fuel pump suspicion. I replaced the original fuel pump with a Delphi unit 4 months ago. To verify the new pump is at fault I had to rig up pressure gauge in the fuel line. No pressure test port from the factory. And what do you know, 37 psi when should be 58 psi, and drops to 0 when engine is shut off.
Great informational on the lean fuel code issues! You hit every bullet point dead center. This is the first video Ive seen of yours, but can guarantee I'll be looking through more for help along the way. I drive a 1st gen Expedition 4x4, and have same lean code. My issue is the front wheel hubs bring more unregulated air into the system. Great video and look forward to learning some more wisdom for Your Car Guy DR!
Keep us Rollin 🛞
How would wheel hubs bring in unmetered air?
@riflebear1711 First gen ford expeditions four wheel drive Vacuum lines
p0171 code is so hard lols i still got this code for 3 months now i took it to MIdaS and they clean my MAF sensor only and the engine light came back on an hour later lols... paid them 100 bucks for cleaning the Maf sensor for nothing... they dont know whats wrong with it lols...
I'm gonna put in work on an 07 Corolla and this code is one of them beside the p0420 which is a bad cat but. I'm hoping it's the maf or 02 sensor. But thank you for this video helped a lot.
I’m having the Same issue on my 2006 corolla p0420 and p0171 did you get the codes to go away??
I’m going to try this on my 350z I have had that code for a couple months now and today heading home from work it dropped rpms and didn’t want to a accelerate when I step on the gas.
Having a similar problem with my Maxima. Did you get yours fixed?
@@maliquepaulk3014 yea I just changed my gallery gasket and put another new set of spark plugs and the solve the problem
was it the fuel pump?
Some good info, and insight, on this problem. Thank you!
My 02 Tacoma started acting up last night (Check engine light came on....then it didnt want to maintain idle, and would fall off flat at WOT on the way home). Luckily, it's a manual trans, or AAA would have encompassed the rest of my evening.
Interestingly, I had JUST dumped a bottle of Dry Gas (with injector cleaner), in it yesterday because of all the temperature swings, and rain we've had on the East Coast, lately. Hrrrmm
Limped it home, and pulled the engine codes : PO171, and PO136. I'll start with the O2 sensor, check for vacuum leaks, and move on from there.
If fuel pressure is at spec, and the injectors are all at their respective factory specs for resistance, do you think a clogged CAT could contribute to this issue in any conceivable way?
Thanks for any reply, and your time. "Liked, and subbed." 👍
If it just started happening after the dry gas was added I would try to get to a second tank of fuel and see if it clears up. Clogged catalytic converters are pretty rare.
Did you end up fixing it?
It's always simple for some reason it's always a vacuum leak or what about intake manifold gasket use do a smoke test first
**WARNING...Corolla Virus**
my case ended being something simple,,,the maf sensor,,,reading 121 on a 90 degree day,,,swap it,,,took away the code.............
New Subscriber 4-3-22
Thank you for perfect explaination. 👍
Super helpful video! Thank you for getting right down to business and not rambling for 10 minutes first
That’s right these car dealership can take your money and they still didn’t fix the problem you should sue and get your money back they are money hungry I have the same problem and things you don’t need and you only going because your check engine light on I will never do that again try and fine the right mechanic that knows what he’s doing or ask a good friend where they take there car that they can recommend never go to a car dealership.......
@Your Car Guy DR. i have a 2003 Camry with 540k miles my first ever car still running like a Gem. after replacing the Evap Canister i noticed i was gettting the P0171 checked ALL the air intake sensors hoses etc. .. issue Fuel pump. thanks for helping GPA car get back on thr ROAD
540k miles ?????
A dealer didn't check fuel pressure????? my God this is just basic stuff to check even for someone who is not a tech. like me. Seriously?????
I agree.
Play previously had a po171 code just recently within a month. It's running very underpowered hard going up hills etc..
About 9 months ago I was driving on the highway and the car crashed right out just stalled right out. I don't know if the fuel filter was checked and I know there are one in the same mounted on top of the fuel pump that was changed over so the new fuel pump would also include the new fuel filter especially on that car is that correct? Can anyone tell me this otherwise I'm going to have to die back in and replace the fuel filter if that's the problem
It depends on if you bought a complete fuel pump assembly that included the filter and pressure regulator or if they just put a new pump in the original assembly.
At least he's diagnosing and replacing afterwards...instead of using the customers money to diagnose an issue...
I have ths same code on my car rite now car idles rough and when idling something it will try to stall
Check the intake piping for any possible air leaks and check fuel psi.
I have that exact issue. I was trying to fix it for five months and changed o2 sensors and Maf sensor with tune up. I don't see your video on the fuel pump! I need to replace the whole kit. Do you have that video? Thank you very much!
Replacing The Fuel Pump Corolla
ua-cam.com/video/aGx2zgXY5CE/v-deo.html
The poor owner... head gasket, o2 sensor, MAF... oh my christ.
I did the following and still running lean
*Changed oxygen sensors twice.
*Changed fuel pump
*Clean Maf Sensor
*Intake manifold
*Welded a crack in the exhaust manifold.
What am I missing?
It is possible you have a bad MAF sensor. I would verify fuel psi and inspect for vacuum leaks. One or more faulty or plugged fuel injectors could also cause an issue.
This is the exact same problem my son is having with his '07 Corolla
Same here. Did he get it fixed and if so what was the issue please help
@@dre6036 did you get it fixed
Had the same code and was lucky that all it took was cleaning the MAF sensor.
man, why was everything else changed before checking pump pressure? That an amateur move
It was the dealership that did all of that!
My Toyota V6 was doing same thing replaced everything MAF, Oxygen Sensors, throttle disassembly and cleaning to dealership no avail only thing that worked was several aggressive treatments with Cheveron fuel injector cleaner just got it to pass smog. Might have to drop tank.
Very informative. Thanks. The fact the dealer just threw parts at it is pretty disheartening and disgusting. Of course they charged for all that unneeded work.
So well explained /clarity 👏🏾 👌🏽
Im going to change 02 sensor on camry 2011 se tomorow
Thanks for the vid i have a feeling my 08 xb may have a fuel pump issue got the car with 180,000 might have to check the pump a lot of the parts on this car seem original🤔🤔🤔
I don't understand if you now the pressure is drop why change injector but over all it help me
Injectors like other parts wear out over time. They can still be working and not performing as well as they should. In this case the worn injectors were causing a rough idle and lowered performance. New injectors can help return an engine to like new performance.
haha the dealer just shotgun parts in attempt to fix it. i work at lexus and im still scratching my head i have an 2003 matrix 1zzfe. fuel pressure check is next followed by smoke the engine to see if i can find any vacuum leak. i already replaced intake manifold gasket per service bulletin. car was fine before i put in new clutch n flywheel. no kinked lines from removing subframe and my wiring grounds are solid.
Appreciate,that's probably my Problem!!!
Thanks you really help any information is very important to those don't have money to pay to the mechanic Thanks
Where is the link for the fuel pump replacement? I'd like to see that. Great vid!
Sorry I didn’t get back to you sooner. Let me know if you still need it.
I didn't realize that you're supposed to warm up your car. Is this normal practice?
It depends on the climate that you are in. In colder weather it is good to give the engine just a bit of time to get the oil warm and flowing properly.
Had the exact same issue and solved it with a fuel pump/filter assembly. Turned out to be the filter clogged.
Running in low fuel regularly leads to fuel filter issues...because the whole unit is built into the tank..it's best not to dip too low past the quater mark
@@TheMuzikall - Yes, thank you. It was a used vehicle I had just bought. I usually try and keep my gas above half tank.
Corollas are known for having this code 00-10. I already owned 2 corollas one 03,06 and they both had that issue. My experiences were that the code only came up when the weather got cold. Most of the times check engine light would turn off itself by the end of the day. The mainfold gasket is the main reason that causes this.
Intake manifold or exhaust manifold? I just replaced both so I couldn’t pin point which one it was however I believe in my case it was the exhaust manifold
The reality is that the fuel delivery system is experiencing continuous wear but the computer cutoff for when Toyota wants the customer to address it is much later than when the condition originally occurs. Clogging of the injectors can begin as early as 60-100k but nobody drives with an OBD scanner monitoring longitudinally the change in long term fuel trim.
The gasket would create a lean vacuum leak. In that case the engine calls for more fuel at idle and decreases the extra demanded amount as the throttle body opens
The fuel system degradation would cause a lean code after the engine is pushed. Meaning LTFT increases with more acceleration.
Can this code make your car feel like transmission is going out?????
If the power is low enough possibly.
Weak fuel pressure my issue BMW 2005
Thanks
I have a 2000 Corolla... replace all 4 injectors as a good start and new NGK platinum plugs with 4 coils. Routine stuff and any 'mobile mechanic' can do it cheap.... you buy the correct parts and hire him to install them!
How were you sure it was the injectors? My 2000 is at 180k so it could be that, but I don't like throwing parts at things. That's how yo incorrectly replace head gaskets, as was mentioned.
Parts changer
@@girohead I replaced injectors at about 220K miles at the advice of a skilled mobile mechanic (worked on racing cycles and cars) who has a sophisticated scanner. A 'miss' I resolved this year with 1 'ignition coil wire' for about $70 and 2 minutes time ...
Damn..best video yet on this topic...thx a bunch
Hi since you say CoDE P0171 can possibly be the Gas pump , is there anyway to clean the gas pump and possibly it can deliver more gas ?
The fuel pressure can be affected by several things. First if the fuel filter is plugged. Next if the pickup screen is plugged. Next would be the fuel pressure regulator. If all of those are fine and the pump isn’t producing adequate pressure or volume then the pump needs to be replaced.
Thanks for the great tips, I'm working on this issue on a 04 Camry at the moment went through all the minor steps, fuel pressure is the next move to verify it's in the right range.
Any update? I have the same car
I had an issue where my pump assembky filter was clogged. Weeks prior i had just replace the injectors thinking that was the issue. I then replaced fuel pump assembly but it already clogged my new injectors. Now, thinking, oglh my i jectors are new, thats not my issue, i replaced so many parts on my car chasing an issue. Month/half later, i get code p016c. Which faulty or clogged injectors can trigger. I decided to reolace them again, issue gone. i spent 1.7k in parts and the injectors were the problem the entire time 😂 😢😢😢😢😢 Cars runs like new tho ❤ ***Dont ask me for the list of parts i replaced*** 😬
can a crack/leak exhaust manifold cause p0171 code and vacuum leak symptoms? 2005 accord 2.4
An exhaust leak can cause a PO171 code particularly if it is at the exhaust manifold upstream of the oxygen sensor.
@@YourCarGuyDR thanks! I will remove the manifold and inspect it.
Came for a tidbit I got a whole great deal of info thank you so much
Where can I get the injectors for a good price, their 200 at autzone
Look online. You can get the same injectors for much less.
😂 that dealer beds new technicians
Sounds like a lawsuit
P0171 code is running to lean Bank one. Bank one is is a 02 sensor
p0171 is set when the reading from the Oxygen Sensor (O2 sensor) is out of specs and too lean. On an in-line four cylinder there is only one bank this bank one. A v series engine would have 2 banks and thus could set a code for too lean on bank two or bank one.
It is a mistake to blame the oxygen sensor for telling you that something is wrong in the engine. They replace the oxygen sensor and then still have the issue. Yes there are times that the oxygen sensor fails. Usually a failed sensor will give other codes. It is always best to diagnose and not just throw parts at a car.
Would the solution the same for a p0172?
The p0172 is for the system being too rich, in other words too much fuel for the amount of air. This can be caused by an injector that is leaking or a restriction in the intake system (plugged air filter etc)
You got my sub 👍 well said now makes it more easy for my to explain
F
Do you have a source for the flow matched reman injectors? I need a set, so many copies out there
You are correct there are a lot of copies. I generally rely on reviews from other purchasers to get a good set. So far I have had good luck.
@@YourCarGuyDR thanks!
It really helped me
Simple explanation , very useful info , thx.
Well I do have this code but I don't think it has anything to do with the fuel pump or fuel filter because I replaced both of them twice within 3 months. But the code was actually reading p0340. Not a camshaft position sensor. I don't care what anybody says. That is a bad fuel pump. Because even after I replaced the camshaft sensor with that code it didn't start. It was a fuel pump. It's common sense if you don't hear the fuel pump buzz. It's bad. My car has been having trouble starting like as if the fuel pump was bad. My car has had a fuel system problem even before the fuel pump went out and ever since I replaced the fuel pump fuel filter the gas cap p0440 And the O2 sensors p0171. The issue is still happening. The engine hesitates to start due to lack of fuel. It's not the spark plugs or air. I know that for a fact. Like I said my car has had a fuel delivery system for a while now. I've been replacing a different part each month. I'm really hoping that it's not a bad timing chain because that can cause a car to have these exact issues as well. Most of the time when my car starts it starts right away but it has like a 1 or 2-second delay. But still starts right away. P0171 bank 1 running too lean Can cause a car to stall hesitate And hesitate to go up a hill or from a complete stop. And most definitely feel like the transmission is sifting hard. My car has a lot of issues but I'm starting to think That the po171 and p0440 Is a blown head gasket because it's leaking oil. That's the only other thing I can think of besides a bad timing chain or a bad fuel injector. But I hooked up three different scan tooland 1 says PO171 bank 1 running lean. And the other scan tool says P0171 O2 sensor heater circuit malfunction. And the 3rd one say p0440 and p0171. Large Evap leak and bank 1 running lean. And no seafoam does not work. That is a bunch of crap. It only made things worse. Trust me and those fuel injector cleaners don't work either or the fuel system cleaners. Problem with the fuel system. None of those feel additives are going to work. Trust me, it's common sense. Tired of wasting money. Trying to figure out what the issue is. But you mentioned head gasket leak and I think that is the only thing that it could be besides a timing chain. Because The engine is leaking oil. And it's leaking onto the exhaust causing the car to sting under the car, not under the hood. So if my car is leaking oil it could very much be a head gasket leak and can leak oil on other metal parts including the timing chain. You are definitely right about people not checking for fuel pressure, but people also don't check the timing chain that has a lot to do with it too. But I know for a fact it's not the fuel pump on my car or the fuel filter cuz I replace those things twice.
Hi there. I got the same diagnostic. Because i think a mecánic took the second heater core out without my permittion. I only have one heater core which heats in cold weather. Do you think is that the problem. He also change my maf sensor and this issue started. Reads code P0300 that im having issues with my maf sensor now. But know they ran another diagnostic. 2 weeks after maf sensor didn't show. But im getting a most likely manifold gasket. Auto parts told me you might have a vacuum leak. Could it be Because my reservoir container underneath i have a leak?
Hello you have a video for p0172 code I just check the injector and that code show up
hammer yt I don’t have a video on a p0172 but it basically means you are getting too much fuel for the given amount of air. A leaking injector can cause this. It can also be caused by a faulty mass air sensor, plugged air filter or even a bad spark plug or coil.
Hi ever I changed my injectors po171comes but power of the car is more then before no vac leak never had this po171 before
I would take a look at the seals at the bottom of the injectors and make sure one of those isn’t allowing some air to pass.
Otherwise remember that this code is caused by either too much air or not enough fuel.
It could be cheap injectors? because I brought first ones 2 of them didn't work . And ck engine comes after half hour seals sat good
@@barryraoufi8119 it is possible that you aren’t getting enough fuel flow from one of the injectors.
I got a 2003 toyota matrix, when cold it start right up, but after engine got warm and try to turn it back on it will take a lot of time to get it run, so it might be that i need a fuel pump?
It is possible. But you want to test the pressure before just buying parts.
Done! When cold pressures goes up to 50psi, after 30 mins running it drops to 20psi
@@honduras25 definitely you have low fuel pressure. The regulator is most likely your issue. I would do the pump at the same time.
my Avalon 02 had same code to lean, checked lines good, but car only turned on to a bogle off. then i removed the air filter and car turned on so just got a new engine air filter in there and its all good now.14$
Def earned a sub for this. This vid was extremely helpful.
I have a 2002 Corolla S. 217000 miles almost. Thank you sir.
100 pts to this video
Can that work for a car that is burning too rich.?help plz
Running rich can be caused by a faulty mass flow sensor, a leaking or stuck open injector, a stuck fuel psi regulator, low compression in one or more cylinders or even loss of spark in a cylinder.
@@YourCarGuyDR thanks for the response
It can be break booter to
You have both of my cars h3lp me
What problems are you having?
I don't believe they did a head gasket. nope don't believe it.
Thanks🎉
Thanks
Correct 🙏🙏🙌💯
How can i fix a p0172 problem on a 99 toyota tacoma 3.4 v6. Any suggestions please comment i already replaced coils, spark plug wires and spark plugs and code still pops up. Please comment below. Thanks for the help in advance.
on ebay is like $70 box... if you buy just the gas pump is like $17 on ebay...