1991 420sel check engine light comes on an hour after I turn it off and goes off after I start it. Any sugestions?

Asked by Aug 20, 2014 at 01:58 PM about the 1991 Mercedes-Benz 420-Class 4 Dr 420SEL Sedan

Question type: Maintenance & Repair

1 Answer

1,445

Check to see if your gas cap is properly sealing and maintaining a pressurized tank. A bad gas cap often triggers the check engine light - and the timing of yours point right to it.

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