07 sti check engine light
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This is a discussion on 07 sti check engine light within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hey guys. I have a 07 sti with stage 2 cobb tbe and accesport and on my way to work ...

  1. #1
    Registered User
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    Nov 2007
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    10

    07 sti check engine light

    Hey guys. I have a 07 sti with stage 2 cobb tbe and accesport and on my way to work this morning the cel came on, so i scanned it and it came up with a p0420, lean cat eff, so i was wondering if anyone else had a similar experience with this. I was thinking it could be a bad 02 since the cat it new, i installed the dp about 2 months ago and haven't had a problem since, and i'm running the ap on 91 oct stage 2 map, so any insight on this would be great.

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  3. #2
    Registered User STiDriven's Avatar
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    Apr 2004
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    St. Louis
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    I've got an 05 STi with a Cobb AP. I also have the Cobb DP.

    I've heard that this particular downpipe can trigger P0420 CEL on occasion if you don't disable the CEL.

    I've had it happen to me once in the two years I've had the Cobb DP - and only while running the stock or my STU auto-x tune (which don't disable any CELs). The Cobb OTS tunes are supposed to disable those CELs. I'd make sure you have a current tune.

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