What causes the EPC warning light to illuminate and the inability to accelerate in an old Jetta?

1 Answers
VonAndres
07/30/25 3:44am
The reasons for the EPC warning light illuminating in an old Jetta are as follows: Intake system malfunction: Such as leaks or blockages. Troubleshoot intake system issues, use compliant fuel, clean the throttle body, etc. Throttle body contamination: Dirty throttle body or excessive carbon buildup. Remove carbon deposits from relevant components. ECU malfunction: Re-flash ECU-related data. This method is used when other faults cannot be resolved. Engine management system malfunction: This condition is often accompanied by unstable idle speed and engine cold start vibrations. It is mostly caused by poor fuel quality and dirty driving environments in the country. In such cases, the vehicle should be immediately taken to a repair shop for inspection and servicing.
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