Code P0420 - 2009 XE AWD - Saturn Outlook Online Community
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post #1 of 3 (permalink) Old 05-17-2014, 04:35 PM Thread Starter
Junior Member
Join Date: May 2011
Posts: 10
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?
O2 sensor
Catalytic Converter($$$)
Gas Cap?
Air Filter?

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

Thank you,

2009 Saturn Outlook XE AWD.
glbbrown is offline  
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post #2 of 3 (permalink) Old 05-19-2014, 09:16 PM
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Join Date: Apr 2009
Posts: 252
Re: Code P0420 - 2009 XE AWD

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.
medicrxdoc is offline  
post #3 of 3 (permalink) Old 05-20-2014, 02:40 AM
Senior Member
Join Date: Feb 2010
Posts: 131
Re: Code P0420 - 2009 XE AWD

Here's a good diagnosis for the P0420 code:

'09 XR, AWD, all options except rear DVD entertainment
XRDreamliner is offline  

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