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rear O2 sensor wiring bad?

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doubleclutch

10+ Year Contributor
830
177
Jun 26, 2009
Canton, Michigan
Have a CEL for the rear O2 sensor, heat circuit and sensor response.

I replaced it (correctly as far as I know) and still have the light even after resetting it.

Anyone else have this problem before?

Doing some more reading, this may be caused because the O2 sensor is working correctly but heating up too much/too little because of the increase heat and flow of the high flowing exhaust. (I expect the high flow cat i have in there to possibly be not enough to clean the air to make the invalid sensor response go away).

Anyone verify this?

I think I am going and getting spark plug defoulers tomorrow.
We will see if that works.
 
Last edited:
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