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I recently moved to Atlanta and I'm looking for a well respected place to help out with my 2006 MS6.
Recently my check engine light came on and its telling me there's too much oxygen when idle. I don't want to go to a dealership b/c I have over 50k miles and they're too expensive.

I put in a cold air intake in April and haven't done any mapping. Could this be the issue?
Any suggestions on where to go or what to do?
Thx!
 

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Can't make any suggestions about where to go.
But, if you're running lean, that is typical of a more-than-anticipated or more-than-metered amount of air entering engine. You should anticipate either the installation or the aftermarket intake, or the intake itself as the likely culprit of your trouble.
First, make sure there aren't any places where unmetered air can enter the intake tract. If temps are getting cooler where you live, it's no surprise the dummy light didn't illuminate until the temps dropped.
 
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