Quote:
Originally Posted by Artifex
Actually, this is false. The secondary O2 sensor does not affect ECU fueling at all. Only the primary O2 does. The secondary is only there to detect catalyst efficiency for OBD2 compliance.
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So you're saying that the fact that he has P0420, along with a random misfire code for every cylinder, has nothing to do with one another? Even if that's true, it's worth spending the $4 to get rid of the code for the cat. It would be a start. Then he'd only have 4 CELs.
