k9sar Posted August 18, 2016 Share Posted August 18, 2016 So the new(to me) pathy is periodically throwing a P0430 code which indicates an inefficiency in the catalyst system bank 2. I have read that a bad O2 sensor can cause this but I would expect an O2 sensor code if that were the case. I'd rather check this first before replacing the front DS cat. So here's my diagnostic logic.. I should be able to remove the O2 sensor from behind the DS cat and swap it to the other side (PS). Not sure how the wiring is but I would think there is a plug or something that I can disconnect that will allow me to swap the sensors but leave the wiring intact (as if I were replacing the O2 sensors). I'll reset the codes and let the wife drive it for another few weeks to see if a code returns. one of the following should tell me my next step(s): 1. P0430 returns - must be a bad CAT or bad O2 sensor harness wire since it remained on bank 2. visually/electrically check wire and probably replace cat. 2. P04xx throws indicating inefficiency on Bank 1. This would say my O2 sensor is bad 3. No codes - must have been a bad connection or something that got resolved when I swapped the sensors. Sound like reasonable logic? Link to comment Share on other sites More sharing options...
Slartibartfast Posted August 21, 2016 Share Posted August 21, 2016 If the wiring will reach, it sounds reasonable to me. Link to comment Share on other sites More sharing options...
byob Posted August 25, 2016 Share Posted August 25, 2016 A failed 02 sensor would be a stretch. Two possible failures are more likely the failed cat or an ecm update. If you have a scanner I would read the line graphs of both cats Link to comment Share on other sites More sharing options...
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