1994 Volkswagen Jetta Q&A
1994 Volkswagen Jetta Question: check engine light
Do you know the fault code associated with the check engine display? Look under the hood for loose electrical conections and check all the hose attachments , especially between the intake manifold and air cleaner. Physically test them by wiggling to be sure they are tight. If the engine simply loses power but does not miss or run rough you may have a mass air flow sensor issue. While the symptoms are evident try driving with the mass air flow sensor disconnected. If things improve your mass air flow sensor is suspect. Get the vehicle scanned , Kragen or Auto Zone stores offer this for free , and see what the fault label is. - spyder
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Due to an ignition component and/or engine coolant temperature sensor failure, the Check Engine Light may illuminate. Replacement of the failed component will be necessary to correct this concern.
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