Question about 2006 GMC Yukon Xl Denali
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Posted on Jan 02, 2017
Posted on Dec 21, 2008
SOURCE: P0101 p0171 p0174 engine codes
Those are lean codes and a MAF (P0101) code. Make sure the MAF sensor is plugged in, and there are no leaks/ loose hoses between the air filter and the engine. You may have a vac leak at the intake also, but check these first, If all appears OK a repair shop will need to check it out for you.
Posted on Dec 16, 2009
SOURCE: P0171 & P0174 Error Codes
For one thing, cleaning a MAF doesn't always work. Sometimes they just need to be replaced. Especially depending on what kind of cleaner you use on them, the cleaner can fry them. Also, both banks being lean and running worse when cold more points to a vacuum leak. Check around for any broken or loose vacuum hoses, and when the engine is cold and running poorly, you can use either carb cleaner or a propane wand to check for an intake leak. If the engine runs better for a couple seconds, you've found the leak.
Posted on Feb 25, 2010
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