Question about 1999 GMC Yukon Denali

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Service engine soon staying on

99 GMC Yukon Denali - service engine soon light came on today, ot's about due for a 3,000 mile oil change, could that be the reason? just purchased vehicle last Wednesday, please help me

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Yes.. that is the reason why the service engine light came on. Bring the car to the dealership and have the oil changed. They will reset the oil change counter for your vehicle.

Posted on May 25, 2009

  • David Gerzseny Feb 19, 2012

    I have a 99 Yukon and my light never goes on for an oil change. I usually change it every 3000 but have gone beyond that a few times in the past 11 years I have been driving it. My light is on now though,, and it is a bad O2 Sensor that is located on the pipe just after the catalytic converter.. bank 1 sensor 2. Code P0141. A scan will tell you the problem. Where you bought it should do a scan for free since it has been such a short time since buying it. Advanced Auto will do it for free or Harbor Freight sells them for around $40. A worthwhile investment.

  • David Gerzseny Feb 19, 2012

    Also, a loose gas cap will turn on the service engine light. Make sure you click your cap shut after getting gas by turning it 1/4 turn when it starts to click. Could be a bad gas cap too with a bad seal.

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This is a warning light that is illuminated when there is a problem affecting the Emission system and the engines computer management (ECM) has detected it from a fault. It could be something as simple as a loose or defective gas cap. If the SES light is blinking, it's more serious....
The yukon needs to be connected to diagnostic equipment (scanner) for fault diagnosis.
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Good luck...i hope this helps and will fixya up.

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