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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.
Wiki User
∙ 13y ago
Wiki User
∙ 15y agoThere are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
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