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Originally Posted by maxwedge
All this sensor business is guess work, a full scan should be done to check the post cat sensor for rate of switch after warmed up and no existing other codes, thpost cat sensor should be maintaining a 450-650 mv reading, better done with a graphing scanner to compare switch rates with the pre cat sensor, change parts and experimenting is not the way to fix an OBD11 car.
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Agreed.
It is well known that these cars do not like aftermarket cats, hence need for the O2 simulator I refered to earlier with an aftermarket cat. Also, the rear O2 sensor is only used by the pcm to check function of the cat. It does not affect mileage, engine life, or driveability.