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Need advice with diagnostics code P0171 #330814 Nov 19, 2:10pm Nov 19, 2:10pm
Joined: Nov 2004
Posts: 12
Maryland
2000 Silver Toyota Celica GT
Matt007 OP
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Need advice with diagnostics code P0171
I have a completely stock 2000 Celica GT. The CEL recently came on with error code P0171, which means the front O2 sensor is indicating a lean mixture. Coincindentaly, this happended about two days after I got it back from the dealership to have a brand new transmission and clutch installed (which feels great now...but that's another story).

I cleaned the MAFS, throttle body, and visually inspected any vacuum hoses I could without taking anything apart (Cleaning the MAFS really smoothed the idle and quickened accelerator response). I reset the ECU, but the CEL came back shortly.

I then took it back to the dealer who did the transmission work, who said that it is running lean, but only at idle, and that the O2 sensors and MAFS are fine. They think it's an "Intake leak", which I assume could include vacuum hoses, Intake manifold, etc.

Any suggestions would be great before I give it back to the dealer to inspect for a day or more.

Re: Need advice with diagnostics code P0171 [Re: Matt007] #330815 Nov 19, 2:12pm Nov 19, 2:12pm
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isaac
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What did THEY suggest to fix the "Intake leak" THEY think it is ?


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Re: Need advice with diagnostics code P0171 [Re: isaac] #330816 Nov 19, 4:08pm Nov 19, 4:08pm
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Nothing yet. They said they would need me to leave it a day to diagnose exactly where the leak might be. They had already spent half the day with my car just to tell me this.

Re: Need advice with diagnostics code P0171 [Re: Matt007] #330817 Nov 19, 4:10pm Nov 19, 4:10pm
Joined: Nov 2004
Posts: 235
San Antonio Texas
Haggard
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Haggard
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Hey Matt, how muc did you pay to have ur clutch and tranny replaced?


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Re: Need advice with diagnostics code P0171 [Re: Haggard] #330818 Nov 19, 4:12pm Nov 19, 4:12pm
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Well, I got them to "throw-in" an oil change, coolant flush, new spark plugs, and a new rear main engine oil seal with the new (not rebuilt) tranny and clutch for $3400. I definitely paid dealer prices, but I wanted someone to complain to when something goes wrong. The tranny has a 1-year, unlimited miles warranty.

Re: Need advice with diagnostics code P0171 [Re: Matt007] #330819 Nov 19, 4:14pm Nov 19, 4:14pm
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San Antonio Texas
Haggard
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Haggard
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San Antonio Texas
Nice...Im getting my shit done as we speak...
im paying 3850 for the 60k mile service, a new tranny and cluth replacement...and brake job...

its good to hear what someone else paid for it...

it drives nice tho?


2000 Celica GT-S Spectra White

Current mods:
Magnaflow Cat-back Exhaust

Currently saving for custom turbo....MUST BE F/I!!!!!
Re: Need advice with diagnostics code P0171 [Re: Haggard] #330820 Nov 19, 4:17pm Nov 19, 4:17pm
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The tranny and clutch are great...very smooth. You forget how nice it felt new over time. Of course, I apparently had a countershaft bearing failing, so it was a little rougher than it should have been for quite some time before it finally blew apart...leaving me with a lot of missing teeth.

Re: Need advice with diagnostics code P0171 [Re: Haggard] #330821 Nov 19, 4:19pm Nov 19, 4:19pm
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Haggard -

You might want to have them do the rear oil seal if it's not too late. It's a cheap part they have to take off anyway, and it would be 500 bucks later if it fails.

Re: Need advice with diagnostics code P0171 [Re: Matt007] #330822 Nov 19, 4:20pm Nov 19, 4:20pm
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San Antonio Texas
Haggard
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Haggard
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shit, my synchros had issues for a while...and they eventually allowed my tranny to destroy itself...oh well...im glad to hear it drives well tho...it was f'd up when i bought it, so i dunno what a good trany costs...ha ha ha...shit happens...


2000 Celica GT-S Spectra White

Current mods:
Magnaflow Cat-back Exhaust

Currently saving for custom turbo....MUST BE F/I!!!!!
Re: Need advice with diagnostics code P0171 [Re: Haggard] #330823 Nov 19, 4:20pm Nov 19, 4:20pm
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San Antonio Texas
Haggard
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Haggard
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whats that? i think they may be doing it already...


2000 Celica GT-S Spectra White

Current mods:
Magnaflow Cat-back Exhaust

Currently saving for custom turbo....MUST BE F/I!!!!!
Re: Need advice with diagnostics code P0171 [Re: Haggard] #330824 Nov 19, 4:33pm Nov 19, 4:33pm
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Maryland
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The seal they used is part# 90311-76001. Honestly, I'm not sure where exactly it sits, but another mechanic friend told me to have them do this.

Re: Need advice with diagnostics code P0171 [Re: Matt007] #330825 Nov 19, 4:34pm Nov 19, 4:34pm
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San Antonio Texas
Haggard
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Haggard
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alright, cool man, thanks for the advice...


2000 Celica GT-S Spectra White

Current mods:
Magnaflow Cat-back Exhaust

Currently saving for custom turbo....MUST BE F/I!!!!!
Re: Need advice with diagnostics code P0171 [Re: Haggard] #330826 Nov 21, 1:22pm Nov 21, 1:22pm
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waveI'm hoping someone has some insight on my original post (above) regarding my engine running lean. Any advice would be appreciated.

Re: Need advice with diagnostics code P0171 [Re: Matt007] #330827 Nov 21, 2:30pm Nov 21, 2:30pm
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El Paso, TX
EuRoBoYGT
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i have the same problem but it's my O2 senor that got shorted out...

i have a lot of electrical problems in my car.


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Re: Need advice with diagnostics code P0171 [Re: EuRoBoYGT] #330828 Nov 21, 3:05pm Nov 21, 3:05pm
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The dealership says the O2 sensors are OK. The wiring looks OK - no visible shorting.

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