Code P0420 - 2009 XE AWD
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?
During acceleration engine does sound a little rough. Mileage 149,xxx.
2009 Saturn Outlook XE AWD.