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What to check when check engine light in a 1992 mercury grand marquis?
Wiki User
∙ 13y 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
Wiki User
∙ 13y ago
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