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So my CEL came on throwing a P0420 code on bank 1!
I've changed the downstream 02 sensor previously but not the upstream sensor.
What's the chance it's the sensor and not the cat?
Thanks cruisers
A very good chance it's the oxygen sensor or an air leak. Visually inspect to see if you have holes in your exhaust and replace the oxygen sensor.
Try this thread:
P0420 Code Solved, insights gained
Posting this in case it helps somebody else down the line. I've been chasing down an intermittent P0420 code since I purchased my 05 a couple months ago. Thinking maybe this was the last straw that caused the PO to trade it in which is fine by me. There are a whole bunch of threads on this...forum.ih8mud.com
Interesting. I threw this code yesterday. I cleared it & will see if it returns.When I clear the code it takes roughly 1 week to come back