Hey everyone, as i stated in the title im throwing a P0420 and a P0300, i think the P0300 is related to the dynoflash which Al stated in his section of the forum, but the P0420 must be from my cat. How would i go about fixing this problem? Would i just have to buy a Aftermarket O2 sensor? Any helpful info would be great Thanks alot.

 

actually the dealer has a tsb for a reprograming to fix those codes, they should do them free of charge. but like you said, if you have flashed computer you dont want it reprogramed