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Old 02-08-2008, 12:55 AM   #15
Scooby Newbie
Member#: 160287
Join Date: Sep 2007
Chapter/Region: TXIC
Location: Around Austin, TX
2007 Impreza 2.5i SE
Newport Pearl Blue


Originally Posted by 8Complex View Post
Just curious, but what would an extension be used to fix? Even with my turbo kit on, I have never had a problem.
With an after market cat-pipe, like a high flow cat, the rear O2 sensor is at the end of the pipe. It is too far away for your stock one to reach.

I also heard something about it somehow fixing the CEL, which I don't see how.
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