Need some help peeps. I am throwing a p0420 code. Bank 1.
I replaced both o2 sensors. I also had a misfire in 2. Took the head off and put in some new gaskets. Car is running much better and that nasty misfire is gone. Stupid spark plug gasket! Anyway, it's still throwing the 420 code. Anyone have issues with o2 sensors that may not match up perfectly? I hate to think it's the CAT. Mileage is at 121000. That misfire might have caused damage to the evap system?
Last edited by Ij20me; 08-19-2019 at 08:25 PM.