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Hello,

I currently have a recurring code popping up P0420, as far as I can tell this is Bank 1. Which I believe is the first O2 sensor before the catalytic converters? I have cleared this out in the past, only to return later(either the next day or a week later).

What are the potential suspects?
O2 sensor
Catalytic Converter($$$)
Gas Cap?
Air Filter?

During acceleration engine does sound a little rough. Mileage 149,xxx.

Thank you,
Glen
 

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When my car had this code under the emissions warranty, they replaced the cat and oxygen sensor. Haven't had the problem for over a year now.
 
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