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The check engine light is on because the ECU (computer) has detected a problem with the emissions system. Have the ECU scanned with an OBD2 scanner to retrieve the code that has been set. This code will help you determine what the problem is. Ignoring the light may end up costing you more money down the road. Have this looked into by a professional ASAP.

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Q: What should be done about a Check engine light?
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