my service engine light stays on. I have tightened by gas cap (maybe I need a new cap?). Could an additive to my gas make a difference. thanks
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2000 Oldsmobile Silhouette Question: my service engine soon light stays on
Answer #1matte December 30, 2009, 10:23Master
This is the check engine light, and it's reacting to a fault in your emissions control system. If the gas cap doesn't resolve the light, it will be something else, and you'll need diagnosis. A fuel additive is extremely unlikely to make a difference.