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A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

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  Jim Grant's Tech Tips

'99 VW Jetta GLS, New Used With Check Engine Light

Q: I just purchased a used ‘99 VW Jetta GLS from a VW dealer. On my first drive the engine light turned on and will not go off. I called the dealer and they will be taking a look at it being that it is under warranty for the next two years/24k miles. But I was wondering what could cause the light to turn on now and not when I test drove it. Should I be concerned? Any information would be really appreciated......Tks

A: During your test drive the testing criteria of the vehicle’s computer may not have been met. On today’s vehicles for a computer to run the full range of test the vehicle has to been driven under a variety of conditions. Vehicle speed, operating time, even ambient temperature are just a few of the many criteria that must be satisfied before the computer will perform testing. Once conditions are determined to be correct for testing the vehicle’s computer goes at it. It just may have been a coincidence or you did not drive the vehicle under the right conditions, during the test drive, to enable all testing procedures. Also check the gas cap. A loose gas cap will light that check engine light on your vehicle as well as any others from about ‘96 up.

 
     
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