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The "Check Engine" light means there is a problem with the emissions system. Take it to a professional for a scan of the ECU with an OBD2 scan tool. The fault code that has been set will help the technician to find the problem. Do not ignore this. Some problems may be a simple fix as in a loose gas cap. Other problems are serious and can cause other damage as in damage to the catalytic converter.

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Q: What does the check light mean on a 2004 Chevy cavalier?
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