Thread: p0420 02 gtp

that code is basically telling you that your cat is bad, or in your case, not good enough

edit: if you go back to the webpage where you bought your downpipe, at the bottom, ZZP tells you theres a chance this might happen. in fact it says specifically
"The downpipes we sell come with a Magnaflow high performance converter. It is OBD2 compliant but it is on the very edge of being so. The PO 420 code is set when the rear bank O2 sensor PCM thinks that the converter is not doing a good enough job. Because the stock cat is so thick and dense, it can still function when the tune is off or it gets old. The Magnaflow isn't like that."

Originally Posted by Jakegday

that code is basically telling you that your cat is bad, or in your case, not good enough

edit: if you go back to the webpage where you bought your downpipe, at the bottom, ZZP tells you theres a chance this might happen. in fact it says specifically
"The downpipes we sell come with a Magnaflow high performance converter. It is OBD2 compliant but it is on the very edge of being so. The PO 420 code is set when the rear bank O2 sensor PCM thinks that the converter is not doing a good enough job. Because the stock cat is so thick and dense, it can still function when the tune is off or it gets old. The Magnaflow isn't like that."

well i bought it used off here awhile back... is there a fix for it other than deleting the code?