2000 Corolla failed emission test, P0171 & P0300 - Toyota Nation Forum : Toyota Car and Truck Forums


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8th Generation (1998-2002) Specific discussion of the 8th generation

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Old 10-01-2011, 03:43 PM   #1 (permalink)
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2000 Corolla failed emission test, P0171 & P0300

Hello everyone,

I am a newbie here so please go easy on me. Anyway, I just got this 2000 Corolla, run great with 70K miles on it. I went to do a emission test today to get it registered but it failed the test, the OBD code is P0300 (Random/Multiple Cylinder Misfire Detected) and P0171 (System too Lean, Bank 1). The Check Engine Light (CEL) has been on for a while but I didn't bother to look at it because the car runs great other wise.

Also noted in the report is that it failed the Gas Cap Pressure Test, so I went to Pepboy's and get a new gas cap.

Any idea where to start? Thanks!

--JR
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