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Joined: Nov 2004
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Matt007
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Matt007
2000 Silver Toyota Celica GT
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2000 Toyota Celica GT

Joined: Nov 2004
Posts: 12
Maryland
Nov 19, 3:10pm - #330814 
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.

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isaac
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isaac
2001 Absolutely Red Toyota Celica GT
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2001 Toyota Celica GT

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Los Angeles, CA
Nov 19, 3:12pm - #330815 
What did THEY suggest to fix the "Intake leak" THEY think it is ?


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Matt007
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Matt007
2000 Silver Toyota Celica GT
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2000 Toyota Celica GT

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Posts: 12
Maryland
Nov 19, 5:08pm - #330816 
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.

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Haggard
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Haggard

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2000 Toyota Celica

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Posts: 236
San Antonio Texas
Nov 19, 5:10pm - #330817 
Hey Matt, how muc did you pay to have ur clutch and tranny replaced?


2000 Celica GT-S Spectra White

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Matt007
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Matt007
2000 Silver Toyota Celica GT
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2000 Toyota Celica GT

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Maryland
Nov 19, 5:12pm - #330818 
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.

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Haggard
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Haggard

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2000 Toyota Celica

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Posts: 236
San Antonio Texas
Nov 19, 5:14pm - #330819 
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!!!!!
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Matt007
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Matt007
2000 Silver Toyota Celica GT
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2000 Toyota Celica GT

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Posts: 12
Maryland
Nov 19, 5:17pm - #330820 
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.

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Matt007
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Matt007
2000 Silver Toyota Celica GT
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2000 Toyota Celica GT

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Posts: 12
Maryland
Nov 19, 5:19pm - #330821 
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.

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Haggard
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Haggard

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2000 Toyota Celica

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Posts: 236
San Antonio Texas
Nov 19, 5:20pm - #330822 
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!!!!!
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Haggard
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Haggard

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2000 Toyota Celica

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Posts: 236
San Antonio Texas
Nov 19, 5:20pm - #330823 
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!!!!!
Joined: Nov 2004
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Matt007
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Matt007
2000 Silver Toyota Celica GT
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2000 Toyota Celica GT

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Posts: 12
Maryland
Nov 19, 5:33pm - #330824 
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.

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Haggard
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Haggard

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2000 Toyota Celica

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Posts: 236
San Antonio Texas
Nov 19, 5:34pm - #330825 
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!!!!!
Joined: Nov 2004
Posts: 12
Matt007
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Matt007
2000 Silver Toyota Celica GT
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2000 Toyota Celica GT

Joined: Nov 2004
Posts: 12
Maryland
Nov 21, 2:22pm - #330826 
waveI'm hoping someone has some insight on my original post (above) regarding my engine running lean. Any advice would be appreciated.

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EuRoBoYGT
black & blue 4 you
EuRoBoYGT

black & blue 4 you
2000 Toyota Celica GT

Joined: Oct 2002
Posts: 1,233
El Paso, TX
Nov 21, 3:30pm - #330827 
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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Matt007
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Matt007
2000 Silver Toyota Celica GT
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2000 Toyota Celica GT

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Maryland
Nov 21, 4:05pm - #330828 
The dealership says the O2 sensors are OK. The wiring looks OK - no visible shorting.

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