Lmood

iTrader: (3)

Anyone have this issue? I installed my exhaust on Saturday And this came on this morning with a code for my downstream O2 sensors? Thanks

yishin

Maybe leaking ? Or swap out the o2 sensor
Did u change header ? Hmm is ur exhaust cat back ?
Maybe clean the o2 sensor and put it back in ?idk

Sean

iTrader: (3)

Did you get the code from a reader? First thing I'd do is just reset it and see if it comes back. If it is immediate then an o2 sensor may need to be replaced.

On the other hand some guys with exhaust and/or headers get CEL with codes related to cats or o2 sensors, but so infrequently (every 6 months or so) that they just reset them as they pop up.

yjk1975

Make sure you are not leaking at the joint where header and exhaust meet.

1BAD4DR

Check installation. My installer for my exhaust literally twisted the O2 sensor wiring by using the wrong tool and the metal heat shield was cutting into my wires as well horrible i know. All installer errors.