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I have a 01 bullit, mac o/r H pipe, and magnas.. I went to get it tested and it failed.. brought a some codes.. it didnt pass cat bank 1 and 2.. I think it said.. I still have the 02 sensors in it, now is there any way to run to autozone, pop in a scan tool and erase the codes and try again? How do the codes work.. it would be nice not to have to buy a new catted mid pipe. Thanks for any help