How many miles since the CAT was replaced? It could be the original problem is still there or another popped up.My front catalytic was replaced at 120k after it was verified with a computer monitored test drive by the mechanic. Ironically P0420 came up on the way to the dealership for a 30k service
Bank 1 is both banks on the 2.5. There is one forward AF sensor and one rear Oxygen sensor.I have a CEL on as well, and just found out it's a P0420 code. The guy at Auto Zone said it's probably an O2 sensor by the header since it's in Bank 1. Time to shop around and see how much the part costs so I can just fix it myself.
Do you just "cut & paste" this?the P0420 code is a debacle. you can google it or search the plethora of online forums about it, it's unbelievable common and a bogus issue.
a $5 02 extender off ebay solves it most of the time. that's the best place to start before jumping into this big mess.
I should, or create a thread I can link to.Do you just "cut & paste" this?
But it doesn't cause any issues:This is the type of advise that gets on my nerves.
light should go out on it's own if things move back into specifications.Does the check engine go out, or does it have to be reset?