Question about 1999 Chevrolet Monte Carlo

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Check engine soon light stays on got new gas cap and a new sensor stll comes off and on

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Have the gas filler tube checked. Montes are known for rotting gas tubes.

Posted on Aug 11, 2010

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Posted on Jan 02, 2017

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1 Answer

Gas cap service engine soon light comes and stays on?


Sorry mate, I dont know what this Gas cap is, could be the fuel filler cap, could be the car runs on LPG and it is a cap on the Gas charge line.

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How do you turn off the service engine soon light on panel


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Wells EVAP Training with Sgt Tech P0440 P0441 P0442 etc

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The SES light will come on with a missing or defective gas cap. Try getting a new gas cap and installing to fix the problem.

Otherwise, have the SES light scanned to see what other problem may exist.

Hope this helps.

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