Question about 2006 GMC Yukon Xl Denali

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Denali p0171 and p0174 codes - 2006 GMC Yukon Xl Denali

Posted by Anonymous on

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

fixincars
  • 335 Answers

SOURCE: vehicle will not run when

Tose are lean codes the 02 sensors are seeing a lean condition and likely its the mass air flow sensor or the intake hose to the engine is loose or cut.
contact me if you need more information please
www.aceautomotive1.com

Posted on Aug 02, 2008

  • 184 Answers

SOURCE: Yukon Denali Fuel Trim bank One and Two running too lean?

Could also be fuel filter, pressure, vacuum leak, etc. Check these two articles out, they should help too - http://www.obd-codes.com/p0171 and http://www.obd-codes.com/p0174

Posted on Dec 21, 2008

  • 7353 Answers

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

  • 110 Answers

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

  • 82 Answers

SOURCE: P0171, P0174

po171 fuel injection system to lean bank 1 po174 same thing but bank 2 that could be the oxygen sensors

Posted on Apr 05, 2010

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Yukon Denali Fuel Trim bank One and Two running too lean?


Could also be fuel filter, pressure, vacuum leak, etc. Check these two articles out, they should help too - http://www.obd-codes.com/p0171 and http://www.obd-codes.com/p0174

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