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Q: my service engine soon light stays on on 2000 Oldsmobile Silhouette

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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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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.

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