P0171 code solved

2002 Toyota Corolla P0171 code diagnostics and solved after dealer failed.

[@CeeJay-pr5eg]

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.

[@YourCarGuyDR]

Thank you. I appreciate your kind words.

[@CeeJay-pr5eg]

@@YourCarGuyDR very welcome!

[@greewaltgreewalt7533]

If you want to monitize utube and commercials

[@moonlandercmdr64]

@@MrRusell86 but its my car not his car, you're wrong

[@tonyvision3097]

Lol osha trainer here and I agree

[@roysandoval8230]

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 👍...

[@DougHinVA]

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.

[@mayken6661]

@@bojukakt222 MAF sensor cleaner. Can’t do much else, they’re fragile

[@AlwaysLookingUpUFOSOUP]

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 🛞

[@TheMatthewDMerrill]

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!

[@hausimports9858]

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

[@captinbeyond]

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.

[@TehKaiser]

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.

[@MrKmchazlett]

Wow! Very detailed, informative, professional, and awesome insight. Great presentation buddy.

[@szzpawnkntrl2018]

My Lord you are outstanding 🙌 so precise and perfect on all the info THANK YOU for your efforts in helping all of us!!!

[@parallelpost]

I was reading your subtitles, realized I had to watch the vid 👍 I've been dealing with a p0171 since 2019 when I bought my 03 MB C230K coupe as a project car for my gf... I replaced the fuel pump yesterday, the dealer had replaced the pump in 2010 but my code is intermittent so I had a specialty shop clean my MAF sensor, passed smog recently and I didnt need an upper oxy sensor and my cat is good. I replaced the coil pak, plugs, purge valve (the shop didnt catch it) after repl. the gas tank filler neck leak (typical w/2005 model)... I bought this m271 engine because the hoses were like new until the lower radiator hose broke from the manuf. clamp/age. I currently have a EGR valve hose that inexplicably got a razor like slit after it got smogged. I wasnt showing the p0171 code so I just taped it up and heat taped it but I've never ran a pressure test on it just went underneath and took a scope to the engine to inspect the hoses as I keep them up. Post fuel filter replacement I showed a p0301 misfire cyl 1 after I swapped around the coils and plugs. Cleared the DTCs, it coughs sometimes when started but seems to have a hard start or kick like sensation felt in the pedal. I bought the injector for cyl 1 last June but the fuel additive seemed to have done the trick the last six mos. The car purrs along at 33 mpg hwy, 27 mpg city, handles hills, hard to see that I have compression issues. Gonna replace all 4 injectors and go from there. Might buy a new fuel pump, we shall see. I shoulda just put in a new MAF sensor but the shop was hesitant to put in any new parts I bought so I dont go there anymore. I caught more dirt in the engine this summer compared to last year.

[@YourCarGuyDR]

If you can run a fuel pressure test before replacing the fuel pump. Low pressure can be caused by a bad pressure regulator or clogged filter among other things.

[@DJJamofThaDose]

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.

[@charleedoessolarmaintenain9149]

Any update? I have the same car

[@angelmongelos8354]

Came for a tidbit I got a whole great deal of info thank you so much

[@camaro84rules]

extremely helpful, have a 00 Tacoma and just got a 171 code, yay...

[@lepraconstud]

Quick and down to the point awesome video guys thank you for posting

[@jonny2426]

Super helpful video! Thank you for getting right down to business and not rambling for 10 minutes first

[@Hugh_Manitee]

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.

[@TH3FOODMAN]

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.

[@mosthated8190]

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%

[@edgara6333]

Where did you buy them?

[@eddyvila6686]

Thanks you really help any information is very important to those don't have money to pay to the mechanic Thanks

[@daedru3316]

@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

[@jonjon9237]

540k miles ?????

[@danny117hd]

Glad you got throw parts at it. There weren't many left. Good job.

[@reivax9120]

Simple explanation , very useful info , thx.

[@liemche6759]

Very helpful thank you for showing this VD love it

[@motomoto8080]

Damn..best video yet on this topic...thx a bunch

[@ericaennishearder513]

Thank you for perfect explaination. 👍

[@MOUSEBOWEN]

Oh wow. My 2000 Toyota Corolla it has the check engine light on PO 171 . And sometimes will say misfire on cylinder number 2. And I reset the light drove it pass the emissions and right away after I drove away from the shop light came back. I reset it few times and keep coming. So this is amazing video I’m going to look for that diagnostic

[@YourCarGuyDR]

Mouse Gipson with yours make sure to check for an intake manifold vacuum leak at cylinder #2.

[@soggynoddle]

Def earned a sub for this. This vid was extremely helpful.

[@andreysimonov1667]

Thank you for sharing! Great right on the spot brief explanation

[@kellmarktv]

So well explained /clarity 👏🏾 👌🏽

[@marthab4172]

I have a 2002 Corolla S. 217000 miles almost. Thank you sir.

[@jeffpolakiewicz6176]

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.

[@soniarican6275]

Wait you Disconnected it and then connected it back on or ?….

[@chiya2006]

How did the car start when you disconnected the purge valve ? Just curious

[@maungmaung4037]

Yeal my old man 2006 Mazda 6 have struck open purge vale make that code before .

[@jimgordon3206]

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.

[@myifamily06]

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.

[@antoniop5889]

I’m having the Same issue on my 2006 corolla p0420 and p0171 did you get the codes to go away??

[@tyronegreen2020]

Appreciate,that's probably my Problem!!!

[@mark.r8900]

Great video. My 2007 audi a4 b7 is having this same code. My rail fuel pressure is around 700psi. Is this ok? Also when I was checking for vaccum leaks I pulled the brake booster hose but I don't know why my engine rpm is not reacting at all. Shouldn't the rpm go up because I've just created a huge vaccum leak? Any help would be greatly appreciated. Thanks.

[@soniarican6275]

Luckily My Fuel Pump was $130 with everything assembled in One 🙌🏽💯🙏🏽👏🏽

[@moss8448]

Had the same code and was lucky that all it took was cleaning the MAF sensor.

[@chilidog4557]

Warning about those kinds fuel assemblies. I'm not special mechanic but there's like a sponge like thing inside the assembly (at least in mine there was), if there's a lot of miles on it, I'd go the expensive route and get the whole assembly. I took apart the assembly and went the cheaper route and just replaced the pump and filter. Then I discovered the sponge stuff inside, took out the fuel pressure regulator, I put a small piece of hose to where the fuel pump goes, I blew some fluid through with a squeeze bottle, the fluid was blackish silver. This only happend when I took it apart though. When doing a fuel volume test, the fuel looked clean. So I'm assuming something faulty with sponge thing as well. My car also passed the fuel pressure test but did not pass the fuel volume test.

[@vkhiev]

Thanks for Awesome explanation 👏

[@jlc7300]

Wow! bet they got soaked at the dealership for the head gasket job that they didn't even need!

[@YourCarGuyDR]

jlc7300 yes they did.

[@treydaypnw]

Yeah 4 real! I'd be pissed.

[@JuanHernandez-jj9rj]

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

[@TheMuzikall]

That's a crime😥.. they could hv done a Compression test instead of removing the Head and Still not solving the problem

[@jasonconcept]

Sounds like a very dishonest dealership (is that redundant?). Simple tests would have shown a blown head gasket.

[@treydaypnw]

Great informative video! Keep em' comin!

[@elgatogordo9523]

Wow! Thanks for your descriptive video. I’ll check the fuel psi on my 97 Camry and the fuel filter. Bought the car used and not sure if the filter has ever been changed.

[@TheMuzikall]

Honestly. .I am yet to see a Fuel Injected Toyota or Japanese car with a Fuel Pump problem...it's unheard of..MAF issues ..yes..Fuel pump...nope

[@MF-le7fp]

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." 👍

[@YourCarGuyDR]

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.

[@daynasmith]

Did you end up fixing it?

[@mateogamez32]

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.

[@mosthated8190]

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

[@TehKaiser]

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.

[@cynthiafranklin6054]

It really helped me

[@Catman1987]

i have a 2001 Toyota corolla S with 80,000 original miles , I have only the P0171 system too lean bank 1 , I changed out the mass airflow sensor after cleaning it good the CEL came back on , after changing out the 85 dollar new mass air flow sensor , cleared the code , drove 50 miles on the freeway , no more CEL , now time for a star smog test in So CaL .

[@giobarroso1]

You got my sub 👍 well said now makes it more easy for my to explain

[@rudyarce5976]

F

[@tmautosstaustellcornwall5882]

Great video and advice

[@jp7489]

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🤔🤔🤔

[@GMC229]

You are the best

[@jakewood868]

Thank you!

[@francescobedo2602]

Love how you called that crank bolt "...Baby Boy!"... I would have called it something else. LOL

[@trdjody]

😂 that dealer beds new technicians

[@travispratt6327]

Sounds like a lawsuit

[@euroboy3335]

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

[@orionsonny3220]

a trick : you can watch series at Flixzone. Been using it for watching loads of movies recently.

[@vihaantucker2850]

@Orion Sonny definitely, I've been watching on Flixzone} for months myself :)

[@jaxsonkareem5738]

@Orion Sonny Definitely, I've been watching on Flixzone} for months myself :)

[@briggsjefferson9940]

@Orion Sonny Yea, have been using flixzone} for since november myself :D

[@saamira7495]

Great video 👍🏻

[@josebarajas6778]

Thanks🎉

[@DougHinVA]

Accept that most dealers and mechanic shops make money selling parts. The labor is not a money-maker. I found 2 mobile mechanics and have a "fall-back" if 1 is unavailable and never quibble about their labor cost and if they are willing to explain or show me what they are doing... I pay close attention. That's how I learned to set up electric guitars and now I can do nearly all of it myself. Basic tools and knowledge is all it takes and it can save a lot of annoyance. .

[@RedSrhRed]

We sell our parts at the same cost available to you when you shop at automotive parts retailers. Stop spreading false information. Labor is a 50/50 split. You when some you lose some. You Never know what youre gonna run into during a job.

[@DougHinVA]

@@RedSrhRed I took my post from a pro mechanic with a large following in KZbin vids. What you say is just what you say. It maye or may not be true.

[@rudysmachado5747]

Great vid!👍🏻I Hava po171 code primarily in the winter. The car purrs - no symptoms whatsoever. Should I do a fuel press test? If it is a pump prob, can I swap out the fuel filter Only,i’m guilty of driving around w/ low fuel levels😅

[@YourCarGuyDR]

A fuel pressure test is always a good idea. If you pressure is good you can move on to other items. If it is low you should be able to easily fix it.

[@pvcarmon1]

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.

[@alberteinstein6406]

Where is the link for the fuel pump replacement? I'd like to see that. Great vid!

[@YourCarGuyDR]

Sorry I didn’t get back to you sooner. Let me know if you still need it.

[@AgustinaQuinteroFelix]

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?

[@shafiqullah33mohammady43]

Very very well done sir

[@YourCarGuyDR]

Thank you

[@seanwiggins2461]

Thanks for the answer

[@CarlosSalazar-lh9ww]

Exelente

[@effahprincee8795]

Correct 🙏🙏🙌💯

[@chrisperez2503]

Have this issue with my 99’ ls400 but runs good and idles perfect. Not sure if I need to replace o2 sensor because maf is clean

[@YourCarGuyDR]

It’s rare that this code is actually caused by the O2 sensor. It is more often a vacuum leak.

[@EdgarMendezz]

I subscribed and liked. Good video. I will check my fuel pressure, and see what's up. :)

[@lucasisreal6128]

Thanks man..

[@claudiofagundes9502]

I have a 1997 Lincoln Town Car has the same codes with a check engine light on. Drives great around town. but on the highway cruise control set to 68 miles per hour the second I hit a hill incline the car will downshift to boost power but has no pep at the same time the po171 and po174 codes and engine light kick on if I have cleared the codes prior to this test run. With possibilities being from an O2 sensor vacuum leak or fuel pressure where do I begin. NOTE my scanner shows me my battery volts from the OBD2 port connection is reading 12.5 volts compared to other vehicles at my disposal that's almost 2 volts less could this be causing poor fuel pressure not having ample power to the fuel pump

[@YourCarGuyDR]

Claudio Fagundes as long as you are over 12 volts you are fine. Since you are getting both the p0171 and p0174 I doubt that your issue is an oxygen sensor. I would check for vacuum leaks. I would also do a fuel psi test.

[@2ndbase330]

This is the exact same problem my son is having with his '07 Corolla

[@dre6036]

Same here. Did he get it fixed and if so what was the issue please help

[@Cmoehlman12]

@@dre6036 did you get it fixed

[@robertmorin6495]

Nice fix

[@Cusers]

same on my corolla 06 p0171 no leak nothing. engine stalling in summer above 30 celcius I waited 5 minutes and the car started again 3 time this summer and if I leave the air conditioning on the idle in summer after 10 minutes the engie stall on its own but works very well in winter but only have bad cold idle they work like a camed car lol but after the car runs very well for all the winter I did everything ... I have the car for 2 years it had the code p0171 since purchase written on the obd2 305 000km... clean maf check o2 sensor up and down collant refill fan perfect temp perfect 86c in summer radiator perfect no leak no intake leak no smoke dozen burn oil no code when stall no code when stall no code when run like a cammed car

[@YourCarGuyDR]

Check your fuel pressure.

[@joyace9674]

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.......

[@cigarbuttmutt6023]

great thanks!

[@madelyn3073]

Hello, great video! So to order the built in filter do I search for built in filter? Fuel filter assambly? Or how? Thanks!

[@YourCarGuyDR]

The last time I did this the entire assembly was expensive, however the individual parts are not. You can do it either way depending on your budget and desire to do the little bit of extra assembly. I would recommend changing the filter either way.

[@avrahambrea1919]

No mention of intake manifold gasket those are pretty common on these

[@YourCarGuyDR]

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.

[@dougsanders6034]

Be suspicious of the new cars with plastic intake manifolds.

[@jamey6236]

Thank you

[@jefferysmom696]

At least he's diagnosing and replacing afterwards...instead of using the customers money to diagnose an issue...

[@obxtarheel9191]

i noticed the older 4 runner there.. i have a 1995 4runner 3.0 3vz getting code 25 running lean and i have checked all my vacuum hoses.. now its running horrible in the mornings and rough through the day... at its worst im hitting the gas and its just chugging up and down RPMs.. wants to stall at a stop while in drive.. but revs up fine while in Neutral or Park.. sounds fine too... any suggestions .. also notice the dash lights dim a little when windsheild wipers are moving/blinker blinks/ or when i tap on the breaks.. normal? also i just changed the EGR.. was getting that code aswell

[@YourCarGuyDR]

OBXTarheel91 the lights sounds like a bad ground. Check your battery cables and especially check the grounds where they connect to the frame. This can also cause some engine issues. There are several grounds that go from the body to the engine. If these are bad or corroded clean them up. The running lean can be caused by low fuel psi just like it was for the car. A good upgrade is to replace the injectors with a 4 hole style. You can get a matched set online at a great price. I am currently doing a rebuild on the engine for that 4 runner (same year and engine as yours).

[@obxtarheel9191]

@@YourCarGuyDR ok thank you so much for the info ill look into doing that! and checking the grounds

[@LeroyBraun]

Had the exact same issue and solved it with a fuel pump/filter assembly. Turned out to be the filter clogged.

[@TheMuzikall]

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

[@LeroyBraun]

@@TheMuzikall - Yes, thank you. It was a used vehicle I had just bought. I usually try and keep my gas above half tank.

[@thebunkertv8847]

Injector , fuel pump and regulator. Oe injectors

[@baltsosser]

IF you see that code on the Chevy 1.4L Turbo found in the Chevy Sonic, or Chevy Cruze, AND the 1.8L non-turbo...a great place to start is the plastic valve cover gasket. The design is the failure point. No more than $210 for the part, and with a torque wrench, an easy fix.

[@scottl31]

Been getting P0171 but mostly when it's cold and within a few minutes of starting. Checked with vacuum gauge and it was normal, but did that test on a warm day and in semi direct sun. No abnormal idle that I can see. Then I did a fuel pressure test. Used rubber adapter and brass fitting which came with the gauge to connect the gauge hose to a T adapter. Start engine and it reads steady 40. Then I noticed that the pressure pushed the hose half off the brass fitting and there's a strong stream of gas spraying inside the engine area. Checked all connections in case I didn't have it right. The hose fit well and snug on the knurled teeth of the brass connector. Start up again and it pushed the hose about half way off and again gas spraying out steady, and reading 40 again until I quickly turned it off. My question is: If the pressure is 40 with this much gas spraying out, do you think actual pressure is probably in the normal range? If so, then with the code happening in he cold, all I can think of is to replace the intake manifold gasket. What do you think?

[@aronklein1167]

thanx great video!! Where do i get the parts cheaply for the fuel pump? any link to video to fix it?

[@YourCarGuyDR]

Rock Auto or any online retailer you can good price on it. I use EBay a lot for new parts. kzbin.info/www/bejne/l3jbY62djb5oeac

[@aronklein1167]

@@YourCarGuyDR can you send me the list of parts to fix the pump. thanx

[@YourCarGuyDR]

@@aronklein1167 I would do the pump, filter and pressure regulator.

[@stoneschanify]

Thanks for this video. The other day I was on a hill and the car was in reverse and I didn’t realize… I took my foot of the brake and it started rolling forward. I went to step on the brakes and it was stiff and all of the lights on the dash board came on…. i quickly put the car in neutral and turned it off for a few and it drove fine. Now i notice the brakes get stiff and dont grab if i ‘pump the brake pedal’ several times and now my Check engine, vsc and other light came on. I have the code P0171… could this incident cause a P0171? any idea why this would happen or did this lean fuel code just happen to come on coincidently from a separate issue? any help you can offer is appreciated.

[@YourCarGuyDR]

This is most likely coincidence. The brakes and the P0171 are likely not related unless you have a massive vacuum leak. The brake booster works off of vacuum on most vehicles.

[@victordeanda1517]

Hi, where do you buy the injectors? I have a 2001 corolla and replaced the engine with a 2005. I get a p171 trouble code at 3mph at 700 rpm idle. Would I get the 2005 injectors or 2001? Also knocking under steep uphill. Ive replaced both o2s, cat and fuel pump. I will test for vacuum leaks with a smoke machine. Car has 300k miles. Thanks in advance.

[@YourCarGuyDR]

This can be a bit of a dilemma. If you are using the 2001 computer you will likely want the 2001 injectors. The knocking may be caused by a fuel issue but can also be a timing issues or a bad bearing. One other thing to be aware of is that there may have been a change in the camshafts between the two years. This could included differences in variable cam timing. If possible you would want the computer to match the year of the engine. I have in the past on these cars put the older cam in the newer cylinder head since I was running the old computer. As far as purchasing injectors I usually search online and be sure to look at reviews and verify that you are getting what you pay for.

[@victordeanda1517]

@@YourCarGuyDR thanks again. I only get the misfires like twice a year when i go to Victorville. But all around it gets great milage and good power. I just need fix the code before my next smog check. I dont have the original camshaft anymore, but thats a good point. Maybe ill find a vacuum leak.Thanks

[@Victor-tf9tw]

Hello, I recently allowed myself to get scammed and purchased an 02 Corolla that had this hidden P0171 Code & a salvage title among other issues. They had disabled the check engine light so that it wouldn't come on. Anyways, I am trying to learn as much as I can about this PO171 issue and I suspect it is a fuel delivery problem as well, for this specific vehicle. Upon watching your video, I tried to locate where I could connect a fuel pressure gauge, but as far as I can tell, the area in which you showed in this video, does not disconnect from the fuel rod. It is withstanding the force of simply pulling the line off. In case anyone reads this comment, where exactly do I connect the fuel pressure gauge & where can I buy this 02 Corolla adapter kit necessary to establish this connection? I cannot locate a kit for this make/model online. Thank you regardless for your informative video.

[@cliche4346]

I have a 2000 model which looks pretty much the same, if I remember correctly we might've taken that fuel hose off at the end closest to the engine. Might be worth a try but I don't know what I'm doing, I know we checked fuel pressure though.

[@YourCarGuyDR]

There is a connection coming from near the firewall to the engine. It requires a special line tool to release. You can get a fuel pressure test kit that will have the needed adapters. If I remember right my kit was around $100.00 online. Not name brand but it works for the times I need it.

[@OneChloe]

Same on an 02 Camry v6

[@bonniejohnson1518]

Buick 2000 3.8....my warning light problem began about 2 months ago. First it said gas cap loose, I cleaned it and that was solved...Then it became slightly difficult to start, so I would slightly tap the gas pedal and it would start right up. After a couple days it would start up normally again on the first turn of the key like it always has and still does now........a couple weeks ago the yellow check engine light came on and the code came up PO171. Then it when out by it self a couple days later, then came on again, and went out again...During all of this I have watched my mileage very closely, and my instant mileage for highway driving is 29 mpg, which I the same has it has always been, and the average overall mileage is 22, like it always has been......do you have any idea what the problem would most likely be? Also during this whole time the car has been idling and running very good......Thanks for any suggestions...............

[@YourCarGuyDR]

bonnie johnson because of the difficulty starting I would suspect a fuel pressure issue.

[@bonniejohnson1518]

@@YourCarGuyDR Thanks, that's what i thought also, but it has been starting flawlessly ever sense that few days of mishap about two months ago....

[@YourCarGuyDR]

bonnie johnson is the code still coming on?

[@bonniejohnson1518]

@@YourCarGuyDR it comes on for a couple days, and then goes out by itself , and then comes back on a coupe days later....

[@YourCarGuyDR]

bonnie johnson I would get the fuel pressure checked.

[@CarlosHERNANDEZ-nz3el]

What about a bad gas cap??? Could that be (Maybe) a problem? I have a 02 Corolla and it's throwing me the P0171 code. Cleaned MAF sensor and new O2 sensor, but noticed when I added gas it didn't make the whistling noise when gas cap was removed, no pressure. I'm not a mechanic at all and it's probably a dumb question just curious to ask. Anything would help. Thanks

[@YourCarGuyDR]

The bad gas cap won’t cause this code. It could cause a code for an evaporative emissions leak.

[@ricardoa2894]

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 ?

[@YourCarGuyDR]

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.

[@DougHinVA]

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!

[@girohead]

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.

[@XxXButtXNuggetsXxX]

Parts changer

[@DougHinVA]

@@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 ...

[@chosainz4119]

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.

[@timocallaghan4408]

Do you have a source for the flow matched reman injectors? I need a set, so many copies out there

[@YourCarGuyDR]

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.

[@timocallaghan4408]

@@YourCarGuyDR thanks!

[@danielgtr17]

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$

[@justintowers8230]

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.

[@marthab4172]

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!

[@YourCarGuyDR]

Replacing The Fuel Pump Corolla kzbin.info/www/bejne/l3jbY62djb5oeac

[@wrenchlix]

So if the fuel pressure is fine then the o2 sensor would be a likely problem? Assuming no leaks anywhere

[@YourCarGuyDR]

wrenchlix with no vacuum leaks and good fuel pressure it could be one of the following, mass air sensor, O2 sensor, or a plugged injector.

[@wrenchlix]

@@YourCarGuyDR thanks. I'll have to do some more checking. Replaced the o2 sensor (today) and added fuel injector cleaner (a week ago) but the check engine light came back on.

[@BryanG830]

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.

[@billsmith2212]

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 " !

[@YourCarGuyDR]

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.

[@hellboy.z71]

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.

[@maliquepaulk3014]

Having a similar problem with my Maxima. Did you get yours fixed?

[@hellboy.z71]

@@maliquepaulk3014 yea I just changed my gallery gasket and put another new set of spark plugs and the solve the problem

[@torquey2]

was it the fuel pump?

[@kalpeshkapadia4623]

Thanks