Question about 2003 GMC Yukon XL

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I have GMC Yukon XL SLT 1500 2003 with 89000+ miles. The check engine light came on a day ago. The truck runs great and no change with performance. What are the frequent most issues when the light comes on? Thank you

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Jeeze, so many "common" causes. but THE most likely cause is an oxygen sensor out of range. replacing same and driving several miles might get you lucky and save some money. but note, a restricted fuel or air filter will likewise make this sensor report bad data and set the same code. in other words, don't ignore maintenance issues...

Posted on Aug 30, 2010

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FROM: LustyKid

Denalis are famous for clogged fuel filters. Change the fuel filter first and see what happens, Get the code for the check engine light. It could be you have a clogged EGR ports. Remove EGR valve and clean out the ports, replace with new gasket and see what happens. Advise of results.

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