What happens if you set code on downstream O2 sensor?
What happens if you set code on downstream O2 sensor? With this code set you will be running in open loop regardless of the reason the code is set. Constant open loop operation can’t be good for the cat. If this code only applies to the downstream O2 sensor then it will not affect the open/closed loop operation of the engine. The downstream O2 sensor controls the heat of the catalytic converter. Is the O2 sensor on my Subaru not working? OK, the heating circuit has failed on my downstream O2 sensor (CEL code P0141). As I understand it, this...