Hmm, my understanding is that the post-cat 02 sensors only monitor the effectiveness of the cats and, perhaps, cause the DME is adjust air-fuel to keep emissions within parameters.
Neil
either way if they mess with AFRs I need to look at it. I should just replace all the o2 sensors at this point. "
Apparently INPA can because I was able to fix my issue. As I understand it now, the DME looks at the post cat o2's and uses them to calibrate the pre-cat o2 with the long term adaptations.
Thanks. I guess I need the check my post car o2 sensors..... "
Originally Posted by MDORPHN
