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Eric, Automotive Repair Shop Manager
Category: VW
Satisfied Customers: 29728
Experience:  Automotive Repair Shop Manager, Technician
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Volkswagen New Beetle: The check engine light of my 2004 New

Resolved Question:

The check engine light of my 2004 New Beetle just came on. Also the gear indicator is not working and in bold. What is happening?
Submitted: 4 years ago.
Category: VW
Expert:  Eric replied 4 years ago.

the check engine light only comes on when the onboard computer detects a fault in either the engine management system, transmission, or emission control system. Faults can range from vacuum leak, engine misfire, transmission problem, emission control leak, one of dozens of engine or transmission sensors, or even internal engine or transmission failure. There are over 800 fault codes that can cause the check engine light to come on. And not every one has symptoms you can feel or see or hear.

Now, because the gear indicator is not working and in bold, this indicates a transmission control fault code, which narrows it down to around 100 or so fault codes.

At this point, in order to correctly diagnose the problem, the onboard computer must be read with a diagnostic scanner in order to determine which fault code is set and why. This is the ONLY way to retreive the fault codes diagnose the problem.

Unless you live in California, most major parts stores will perform this service for you for FREE,
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