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2007 SL550 Check Engine Light

Two weeks ago I traded my '99 Prowler in on a '07 SL550 and within 1-week the Check Engine light came on. The gas cap is tight and premium fuel in the tank, but guess it can be a dozen other things wrong. It went back to the dealer on Thursday and hope we get it back soon. We did love it for a little while.

Question: Of the 3 vent controls in the center of the dash, the middle one doesn't shut off air coming out the 2 center vents or upper vent. How does yours work? The 2 outer vent controls DO control the left and right vents.
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