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Why is check engine light on?

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7y ago

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First rule of thumb is to check your gas cap; if it has been scewed on wrong, that will cause your light to turn on. Second, check your engine oil, you might be running low. Next, take it to a mechanic because it could be something worse. It could be anything; broken sensor, engine problems...take it to a mechanic you trust. Or if you still have warranty, take it to the dealer.

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7y ago
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7y ago

The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle.

Generally, a check engine light is lit when there is a problem in the emissions or somthing that is affecting the effectiveness of the emissions.

If the check engine light is flashing a misfire has been detected

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