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Old 11-22-2012, 09:53 PM   #1
Scooby Specialist
Member#: 204304
Join Date: Feb 2009
Chapter/Region: MWSOC
Location: IL
2008 WRX 4D Stage 2

Default Getting a P0139 on 08 WRX

I am just trying to confirm if my rear O2 is starting to go out. This is happening about once a week now. I am getting a P0139 error.

Been told the 08+ are different then the older WRX's so this is not a fix for me.


I replaced the rear 02 about 2 years ago after a wire got damaged. I have not started to get this error till about a month ago. I am thinking maybe this 02 is starting to go bad. They are not cheap. So I want to make sure it is the issue. I am running with a catless downpipe. How can I confirm this is the 02?

The issue only happens when I let off the gas to come to a stop. It happens at random times. My Wideband does not shoe any issues with my A/F mix and my boost stays nice and steady so I do no think I have a leak.

Thanks for your help.
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