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Discussion Starter · #1 ·
Man...I thought I was in the clear from a P0422 for awhile. I know, who was I kidding .

Had the dreaded P0422 about a year ago...Started with changing the front 02 sensors, code still on....changed the rear sensors....code still on. Changed the front passenger cat and it went away ( what I wanted to do in the first place )....Drove for a little over a year with no issues, but it came on again yesterday.
If I remember correctly, P0422 is the right side bank 1. Only thing I "should" have left is the right rear cat.....Anyone think it could be something else?

Any help would be greatly appreciated.
 

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you may have got some bad fuel, it might help to let people know what kind of vehicle/engine your talking about.
 

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you could check the O2 sensors and clean them, if it's using any oil it will foul them. Bad fuel is still an option.
 
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