Repair Safety Notice:
This information is for general instructional purposes only. Vehicle repair can be dangerous.
Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
and consult a qualified repair shop when needed.
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CARADIODOC
CAR REPAIR CONTRIBUTOR
34,308 POSTS
The computer detected a problem, set a diagnostic fault code, turned the system off, and turned the light on to tell you. Your mechanic will read the code. That will indicate the circuit or system that needs further diagnosis.