Toyota - Corolla :: 2007 - Code P0171 - LTFT High / Won't Go Below 21.1%
Jun 24, 2016
I've been chasing this P0171 code for over a year now. STFT is normal plus minus 5 but LTFT won't go below 21.1%. At highway speeds the lowest the LTFT will go is 10-15% then goes back up to 21.1% at idle.
Things I've done:-
- New the air intake gasket to the Orange one
- Cleaned the MAF sensor
- New PCV
- Smoke test reveal nothing (vacuum is at 21-24 in-Hg) (did not smoke test the exhaust yet)
- Changed to used fuel pump. Funny thing here is that now when I shift the car to park the STFT steady increases to 25%. The old fuel pump never done this. But the car feels like it has more power now.
- New gas cap
- Cleaned TB
- Cleaned fuel injectors and flow tested
- New A/F sensor and downstream O2 sensor
All parts were either genuine Toyota parts or OEM Denso. My next course of action is to buy a new Denso fuel pump or replace the ignition coil pack.
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I have an 05 Toyota corolla, and have the check engine light on, I scanned it at autozone and error code is P0171 - System Too Lean (Bank 1). Which shows following possible causes: Faulty MAF, O2, fuel injectors blockage etc. On recommendation from the guy in autozone, I added fuel additive to clean the fuel line/ injectors. The check engine light went away for 9 months. But it is back on again. Tried putting in fuel additive again but the light remains on.
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I just bought a used Toyota Corolla 2002 CE with 120K miles two months ago. the car seemed fine and drives fine too. After a while I found out that the seller had removed the "check engine" light, so I read the error code by a instrument and I got these errors. 171,420,441. And I noticed that the engine burn a quarter oil every 200 miles on long drives!I checked the VSV valve and connected hoses but no problem there. Since the car has just 120K miles, I'm not sure that the piston rings are worn out! I'm wondering what could cause all of these errors?
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Have got a 2006 Azera 3.3 (same engine as Sonata and have had no luck in the Azera section) which is showing Check Engine Light and P0171 code. Have cleared it but it soon returns and emissions are very high. I have tried with my limited knowledge to check the live data via a scanner but everything seems OK.
I've cleaned the MAF sensor but I'm thinking of replacing it but don't want to do this unnecessarily!
Is there anything else I could be checking? Car drives OK and there's nothing obvious symptom wise other than the emissions and the CEL.
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Have got a Azera 3.3 which is showing P0171 CEL. Have cleared it but it soon returns and emissions are well out. Have tried with my limited knowledge to check the live data via a scanner but everything seems OK.
I've cleaned the MAF sensor but I'm thinking of replacing it but don't want to do this unnecessarily!
Is there anything else I could be checking? Car drives OK and there's nothing obvious symptom wise other than the emissions and the CEL.
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Actually I bought a used Corolla 2002 with 120K which seemed fine and the driving is fine. After I bought it, I just found out that the seller has removed the check engine light. When I read the ODB codes, It shows three codes of 0171, 0420, 0441. Also I have recently found out that the engine burns excessive amount of oil. (about a quarter per 200 miles). Actually the driving of the car is fine and as long as I add oil engine it seems fine.I think all of these errors might be just due to a small problem like a broken valve (since it's not high mileage). It seems that there is no vacuum leak from hoses as well.
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I have a P0171 code (lean bank 1 sensor 1) on my 2002 toyota camry 4 cylinder. I don't have any other codes except for an unrelated P1780 neutral safety switch code. It has had both codes for over a year.
I have replaced the fuel filter, the upstream o2 sensor, and the PCV valve. I also cleaned the MAF sensor. The mechanic performed a smoke test and found no vacuum leaks. Did a fuel pressure test and it's normal. Mechanic thought it would be fuel pressure because the car starts a bit slow when cold, but nope. The car runs great and still gets great gas mileage. I've never experienced a misfire in my 12 years of owning the car. I am asking because I am at a loss as to what it could be.
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I have a 2002 Toyota Echo. I just purchases a Creader V code scanner. My car is throwing a P0171 code. The light only comes on at idle or while going under 10 mph.
The data from the reader was:
Trouble Code: P0171
Fuel System sta B1 : CL, using HO2S
Calculated Load: 11.76%
Coolant Temp 188.59 degrees
The Freeze frame data was:
ST Fuel B1: -3.91%
LF Fuel B1: 36.7%
Engine speed: 795.5 RPM
Vehicle speed: 0 mph
Intake Air Temp: 82.4 degrees.
I went back today and ran live feed on the O2 sensors. I'm not sure what STF of O2S: STF means. That was another figure displayed on my code scanner.
The O2S S1 was reading between .04 and about .82. The graph looked pretty normal (I guess) in regards to going up and back down between 0 and 1. I don't know alot about mechanics, but I seen a youtube video of a graph showing it going up and down and what is normal. Mine did that on S1.
O2S S1: STF was: 3.89 and -1.57%
O2S: S2 was a different story. It was between like .58 and .66.
The O2S S2: STF didn't give me a value at all. It just said " --% ". The graph of this was slowly going up but in a small range. It started at like maybe .4 and would go up to say .5. The next wave would be like .45 to .55, then .50 to .60, then .58 to .66 etc. So it was not ranging just between 0 and 1. It had a very tight range that gradually increased upwards.
I built my own smoke machine before testing with the code scanner and I didn't get any smoke coming out of the car except for around the air filter housing where the lid meets the bottom portion. I don't know if it's because I had the air filter wrapped in plastic wrap. Can I have an air leak where the filter cartridge connects that would case a lean code P0171? Maybe I should go try to smoke test again. I did it about 3 weeks ago and I can't recall exactly where I had the smoke going into. I thought I disconnected the PVC hose from the brake booster and plugged it in there. I assume the smoke would get thru the whole system. It took about 2 min before the smoke came out of the filter housing.
The car only sets a lean code at idle or going less than 10mph and I'm coasting in a residential area.
I have an inspection coming up in May and need to get this thing fixed before that. I can't find any other air leak, but I wasn't sure a leak around the filter would cause this and I'm not sure the leak wasn't caused by the plastic wrap.
I'm thinking my only other prob could be fuel related. Fuel filter, fuel pump, clogged injector, or can my O2 sensor be bad and causing this? I've already replaced all spark plugs and coils as well as the PVC valve and cleaned the MAF sensor with the appropriate spray.
The car runs ok. The exhaust seems to smell RICH. Like Gas. I don't think my fuel economy is as good as it use to be. It has dropped from as hi as 42 mpg to between 38 and 40 if I'm lucky.
Back when I was having problems before and realized I had a bad coil, I had tried some injector cleaner. Why the codes were back then, but I had erased them and the car ran fine for about 2 months and the light came back.
My MAF sensor was .14 lbs when I was watching the live data above. I plugged my fuel pressure tester directly into the fuel line coming from the fuel tank and got a reading of between 42 and 44 lbs (car not running, just by trying to turn the engine over). I don't know if that is as accurate (or useful) as having the fuel pressure tester on the car and in line to allow the car to start up and run and watch the tester. I have to wait until my part comes do run the test that way.
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I have an 07 passat with a 2.0 4 cyl turbo and I have an error code of P0171 system too lean (bank1) but engine seems to run just fine, what this code means, am wondering if it is something I can fix or if it needs to go to the shop??
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I have 2007 explorer with the 4.6 V8....
Recently it started running horrible. Rough idle, drives badly, hesitation, etc. Check engine light is on, code P0171. I cannot find a vacuum leak, and i am pretty much at a loss. Before it started running poorly i replaced the thermostat, and flushed the coolant. I am assuming this is a coincidence.
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I get this code, p171, every so often on my corolla. I have cleaned the MAF and finally changed it with one bought at AutoZone. I still get the code. What should I do next?
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I have a 2003 Toyota Corolla with 90000 miles, that gets regular maintenance.
I've tried taking it to the dealership, but all they want to do is blindly follow their flowchart, making me spend lots of money in the process. Per their instruction, I've already replaced the battery, I've done a tune up, including spark plug replacement.
I think it's probably some sensor that is busted. The car has 90000 miles now (I bought it 3 years ago with 59000), and it didn't have this problem before. In the past, it wouldn't rev high. But now, the revs wont go back to normal unless you spend a good 10-15 minutes in park until it "warms up", even though this also occurs in the summer.
Generally though the car has run great. It just revs high when starting up in the morning.
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Baffled that my well-maintained 05 Corolla couldn't smog today. Smog checker said rpms were too high and it got kicked off the machine six times; said he had replaced his cable today. Manual transmission, 96,000 miles and had oil change last week; 93,000 major service included flush of something.
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My 1994 Toyota Corolla idles at around 1500 and 2000 RPM just about anytime I drive it.
It is worst when I first start the car, and it gets better the longer I drive, however, it is still well above a normal idling range!!
I add oil regularly and do check the levels on most of my fluids on a weekly basis!
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After a new distributor, check engine light coming on, getting a code 52, they (Toyota Dealership) replaced knock sensor. Unfortunately it seems to improve a little bit, but same issues happen; engine not running smooth at times. 94 Corolla. In the 223,000 mile club. 1.6
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RPMs fluctuate from very high to very low without me doing anything. It doesn't do it all the time, so far its happened 4-5 times in the past 3 days. I first noticed it when driving, I took my foot off the gas to break and it started doing it and once I hit the gas it stopped. It seems to be getting worse because today I put it in the park and when it should have jumped into idle it started and even when I hit the gas it didn't stop. Like I said the RPMs fluctuate from very high to very low in a few seconds regular intervals.
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I've been getting a P0133 trouble code on my 2001 Toyota Corolla and am stumped as to what is causing it. I've ruled out the obvious stuff: I replaced the upstream O2 sensor and can vouch for the lack of exhaust leaks, since I replaced the entire exhaust system myself a few months back and checked again for leaks after getting the code a few weeks back. I haven't replaced the spark plugs yet (they're definitely overdue) or cleaned the MAF sensor (I've heard that these could be the culprits) and will probably do both this weekend.
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I drive a 2010 Toyota Corolla, 1.8L vehicle. We recently went on vacation to Colorado and somewhere around Fairplay, CO, which is about 9500 feet above sea level, our relatively new car with only about 47K just died in the middle of the road where there was not shoulder or cell phone service. I pulled over the best I could and popped the hood after several attempts to restart to no avail. I removed the decorative plastic engine cover and looked at it long enough to realize I did not know anything to do or try, reinstalled the cover and closed the hood. I was then able to restart the car and go a little further.
It did happen to us one more time and again after a few minutes on the side of the road with the hood open I was able to start it. I was very surprised that there was no check engine light when I was able to restart the car. I would expect if the engine just dies in the middle of driving that it would at least produce a code where I could have some idea of what was going on. I have read about vapor lock, but it sounds like it is more likely to happen on older cars with a carburetor and with the fuel pump under the hood instead of in the fuel tank. Should I try higher octane fuel?
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I have a 2002 Toyota Corolla. On a hot day (the first in a while), I got a check engine light for P0125. I'm going to clear it and see if it comes back. I think it is a false alarm for insufficient engine coolant. If the code and check engine light come back, what should I do?
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I had the front right wheel bearing replaced on my Toyota Corolla (60,000 miles) replaced a couple days ago. One day after the repair, I heard a high pitched clicking noise which was noticeable around 20-30 mph. Yesterday, I still noticed the high-pitched sound but also a grinding/popping sound in front left side when coming to a stop upon every rotation of the tire. Took the car back to the shop to let them listen to the noise, but really weren't very compliant since it doesn't sound like a wheel bearing problem.
Here is YouTube link to noise car is making : [URL] .....
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I have a 2003 Toyota Corolla CE manual transmission with 431,000 (not a typo) miles on it. About 7 weeks ago I noticed that when I turn on my high-beams after driving for awhile, the car dies for a few seconds. All lights go out, radio stops, engine stops and then it starts up again as if nothing happened. It will just do it once in about a half-hour time frame. I can switch the high-beams on and off repeatedly afterwards and it doesn't do it again. I have to drive for about a half-hour before it will do it again. I usually hear a slight pop sound when it does it.
A month later I noticed that if I parked it after driving for awhile, like at a gas pump, and get back in it, it acts as if the battery is dead for a few seconds. If I step on the clutch or open and close the driver door, the car comes back on. It appears that the battery was disconnected. The CD pops out of the player and all the radio station settings are gone. One morning last week I got in, and it had happened during the night. The CD was out, station settings gone, and the clock was 6.5 hours off.
I have had the car to a Toyota repair center 3 times. They have checked fuses, battery, battery cables, grounds, alternator, tensioner, looked for rodent nests, squirrels and I don't know what-all, etc. They can't find what is wrong. I am scared to drive it, but I depend on it. I commute 200 miles/day. I won't leave anything important in the car because I am afraid it will catch fire. I am scared I am going to have a wreck, too, with no lights and no power steering suddenly.
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