Well my CEL just came back on after replacing the Bank 2 upper CO2 sensor. It has been about two weeks without a CEL. So anyway, i had autozone read the code and it came back with only a P1131. The guy there stated it is the senosr after the cat on Bank 1. My question is, where did the P0420 code go? I thought i had to use mileliminators to get rid of that code? Maybe i should just go ahead and replace both sensors on Bank 1. Anybody have the same situation?
