2010 Corolla, P0138 code. Downstream O2 sensor.
10

Asked by GuruPHZFX Jan 21, 2020 at 09:31 AM about the 2010 Toyota Corolla LE

Question type: Maintenance & Repair

Downstream O2 sensor. Replaced sensor with new Denso sensor. Cleared
code. Check engine light returns next day same code. Diagnostic tool reads
.9V (rich mixture). Attempted fixes nothing worked, bottle of Cat cleaner, new
spark plugs, new gas cap, cleaned throttle body and Mass Flow sensor,
bottle of fuel injector cleaner. Any suggestions much appreciated.

2 Answers
10

GuruPHZFX answered 4 years ago

Thanks for response. Yes still same code. I sprayed electronic cleaner on connector contacts, will double check sensor voltage with voltmeter, in couple days when weather permits.

1 people found this helpful.
Mark helpful

Hamudy answered 3 years ago

Hi, where you able to fix the problem. I have the same problem with my corolla. Please let me know it will help!

Mark helpful

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