Mufflers and Tailpipes
Check Engine Light
VW Jetta

Why did the check engine light come on out of the blue on 2002 Jetta GLS?

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Wiki User
2005-11-05 18:34:40
2005-11-05 18:34:40

Get a code scanner for that vehicle and read the code. There is no way to figure out what's wrong without that information. It could be a MAP sensor, oxygen sensor, or any number of things that won't stop the engine but can make it run less efficiently. The computer will tell you what's wrong.

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