Question about 1999 Pontiac Grand Prix

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Service engine light on car runs fine checked all fuses and they good everything works

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  • josephmcclel Jul 14, 2010

    service engine light on and dont go off car runs and drives good oil is good water is good

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HI. This will require you to have the engine CPU scanned for trouble code's. This can only be administered with the assistance of a diagnostic computer scan tool. You can purchase this tool at your local auto parts store, or you can just have the scan ran at your local auto zone parts store, free of charge. Once the diagnostic scan is administered, you will be able to isolate the issues that have caused the check engine light to illuminate.

This scan tool will display a print out code and the location of the issue, on the engine, as well. There are Many issues that will cause the engine light to illuminate, but the most common cause will be a failed monitoring sensor, or sensor harness failure(separated power wire, or ground).

Once you have the codes, kindly return to the site, and post them here. We will be able to assist with more accuracy, once the codes are posted.

  • NOTE_ I suspect that the codes will be related to a failed emissions related sensor or valve.

Posted on Jul 14, 2010

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Hi,

Read :-

http://www.fixya.com/cars/r4008552-check_engine_light_being

Let me know the codes, as it would help us to find the exact cause.

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Jul 14, 2010

  • taran_2005
    taran_2005 Jul 14, 2010

    Thanks for your response!!

    Even though car does not show any driveability issue,it is never a wise idea of ignoring the light. However, no mechanic would ever start diagnosing the fault without scanning the car. Unfortunately, we are all humans and we need to start from the basics rather than experimentation or intelligent guess as we value time and money.

    You are most welcome to consult other experts.

    Thanks for using ' Fixya ' and have a nice day!!


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