Anyone ever had the P0420 code on their caddy? If so, did you guys replace the sensors, or the cats? What fixed it.
Anyone ever had the P0420 code on their caddy? If so, did you guys replace the sensors, or the cats? What fixed it.
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Depends. Any mods? Stock? Is that the only code? I had that code and 2 others after my exhaust ended up dumping too hard and fucking my O2 sensor.
All stock . Mufflers cut off before the tips that’s it. And only other code is C0899
@Sergey yeah its your o2s. Is it dumping or do you have straight pipes running to back. If it is dumping you better get pipes done and replace o2 sensor or you will destroy your cats and need those too.
Heres mine. I had it chopped off before where my X pipe is for like 3K miles and until it threw P0420 and a lean rich code about 3-4 times after me clearing it so i got the straight pipes done swapped o2 sensor and no codes since. If my cats are still good from that yours are probably still good.
^ look for a Mienke that has custom performance exhaust bending quite a few have it.
Only thing is, it was throwing that code way before I cut my mufflers off in the back. And it says bank 1. Not bank 1 sensor 1 or 2