P0171 error on my 06 Corolla, hints? - Toyota Tundra Forums : Tundra Solutions Forum

SDJeff · #1 (**permalink**) 12-11-2008, 06:07 PM

Anyone else get this one? Too lean of a fuel mixture. Any hints to correct it?
Jeff

mustang67408 · #2 (**permalink**) 12-13-2008, 03:04 PM

There are 3 TSB's for this condition.

#1 is for a new engine ECU -- 8yr/80k miles warranty

#2 is for a INTAKE manifold GASKET in subfreezing conditions -- 3yr/36k mile warranty

#3 is for a A/F sensor (not O2) -- 3yr/36k mile warranty

You need a scan tool to be able to diagnose this, or just start replacing parts. I would start by going to the dealership and having the ECU replaced TSB EG041-07.

Good Luck
Victor

bri · #3 (**permalink**) 12-25-2008, 01:07 AM

If the car is no longer under warranty and you want to troubleshoot this yourself, you want to start with #2 on Mustang's list. It's a $6 part, easy to change, and at least up in the part of the country, a common problem for the lean running condition. My 03 had this problem, even though it wouldn't throw an error code for it. I fought this for a long time before replacing the gasket and that fixed it. You can find the full TSB here:

http://toyota.justanswer.com/uploads...rolla_0171.pdf

If the car idles really rough between about 1/4 warmed up and fully warmed up in cold air temperatures (but idles fine when fully warm) then it's the intake gasket. You don't need to drain the collant for the TSB either, just plug the bypass lines on the throttle body while you have it apart. You'll loose a little collant which you'll need to replace.

Otherwise haul it to the dealer and let them deal with it.

esracing · #4 (**permalink**) 01-16-2009, 12:37 PM

this is the fix ,remove the air flow meter /af sensor and look inside at the wire that the air flows by if it has dirt or oil on it you need to clean it with brake cleaner and blow it dry with air low psi .this is a big problem we see with the corrolas and celicas your welcome

SDJeff · #5 (**permalink**) 01-22-2009, 10:35 AM

Thanks for the replies. On the day the Check Engine light came on when it snowed here in South East Texas (which happens rarely). I got the code from my code reader and then cleared it. It has not came back on, yet. I did not take it in to the dealership because I have over 64k miles. I've already had the ECU changed by the dealer because of a jerky shifting of gears problem.
Thanks for the help guys.

corollacel · #6 (**permalink**) 01-31-2009, 02:13 PM

I have an 03 corolla that has had a fast idle since I purchased it about 2 years ago. Recently the CEL came on with a P0171 code. Mechanic replaced the TPS and light went off, but came back on after a couple days. After reading this thread and others about this problem with the 9th gen corolla, I did just as esracing advised and cleaned the MAF with brake cleaner. I started the car and the engine idled down within just a few seconds. Took it for a drive and got no CEL. This took care of my problem. Thanks

mustang67408 · #7 (**permalink**) 01-31-2009, 02:25 PM

Quote:

Originally Posted by corollacel

I have an 03 corolla that has had a fast idle since I purchased it about 2 years ago. Recently the CEL came on with a P0170 code. Mechanic replaced the TPS and light went off, but came back on after a couple days. After reading this thread and others about this problem with the 9th gen corolla, I did just as esracing advised and cleaned the MAF with brake cleaner. I started the car and the engine idled down within just a few seconds. Took it for a drive and got no CEL. This took care of my problem. Thanks

Glad to hear the car is fixed

, but it is a weird code (p0170 Rich or Lean). Toyota has not used that code since 1995, it doesn't apply to your 03. That code went away and was replaced with (p0171 Lean or p0172 Rich). Anyways glad you were able to fix it with help from everyone here at TS.

corollacel · #8 (**permalink**) 02-01-2009, 03:16 AM

Thanks for correcting me mustang.....the code was P0171 lean.

SDJeff · #9 (**permalink**) 02-02-2009, 09:08 AM

I found a diagram showing the location of the air flow meter.

SDJeff · #10 (**permalink**) 02-04-2009, 12:35 PM

I cleaned off my air flow sensor and took a few pics. The wire had a coat of black stuff on it. Cleaned it off and idles and runs better.

corollacel · #11 (**permalink**) 02-06-2009, 11:37 PM

I was confident too soon.

About 400 miles after cleaning the MAF sensor the CEL is back. I guess my next move will be replacing the intake manifold gasket and/or getting a new MAF sensor. I noticed when I cleaned the old one last week that the wire has a small spot on it that looks like oxidation. Maybe that could be the problem. I'm going to work on it tomorrow.