Question about 2006 GMC Yukon Denali

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2006 Yukon SL 4.8L with a check eng light. Had a parts store read the code and then reset it. Seems to be an emissions code and re illuminated shortly after the reset. Where to start at? The dealer wants 100.00 just to diagnose. I am thinking o2 sensors. 35554 mi on it. I have always done the preventive maintenance without any other issues.

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  • fng6200 Jul 25, 2009

    Also I have checked and refueled since this light has come on. I have also been monitoring my Fuel MPG with no significant change if any at all.

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Think u right buddy replace o2 syn first remov old and clean with carb cleaner 85% of tine devier still works just full of carbon should only cost around 30 50 bucks to replace if woks u saved money we all need that

Posted on Jul 25, 2009

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