Question about 2004 Buick Rainier

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2004 Buick Raineer check engine light on; gas cap new and tight.

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Check engine light comes on when the computer detects a malfunction in the emision control system, could be a loose or broken vacumm line, loose gas cap or a sensor.

Drive your vehicle to an AutoZone store, ask them to retreive the trouble codes from your computer memory, they will do that and a print out of the codes and their meaning. This a free service they provide for their customers.

Don't forget to rate this answer. Good Luck

Posted on Apr 27, 2010

Testimonial: "Thanks for quick and pin point reply that will save me money. I already had replaced gas cap from a previous episode."

  • JOHN DAVIDSON May 20, 2010

    If you are the type that likes to dabble in car repairs, especially computer related issues, you may want to check out a "hand scanner", they are inexpensive and always in your box for a quick check of the computer code memry retaining system. Typically the scanners are price ranged from approx. $79.00-$299.00 to the pro scanners that only a certified tech doing business through a shop should have, those type diagnostic tools price from $1,000.00-$40,000 something even a wealthy tycoon wouldn't need to own as he would have his vehicles serviced by his own private technicians.
    The scanners also come with an easy to read illustration of uits uses and also of how to read the codes stored in your computer and what they translate into(example:code P0120 is a malfunction in the TPS circuit) now you also must know that the TPS circuit is the Throttle Position Sensor that reads the relation of the gas pedal(throttle valve) travel through means of a rheostat type device,TPS, and this reading lets the computer know by this information if you are idling(low voltage reading) or pedal to the floor(WOT Wide Open Throttle) thus the computer(ECM Electronic Control Module,brain,command center) then sends the proper signal to the various components to your engines emission devices, allowing the vehicle to run smooth efficient and clean fuel burning.



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