Question about 2002 GMC Yukon Denali

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Oxeygen sensors Where are the 4 oxegyn sensors locacted on my 2002 Yokon Denali and are they easy to replace? have codes 171 and 131 found out it is probably the sensors. first thing thats happened on it though since i bought it new in 2005.

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  • jim sherman Feb 23, 2009

    the only thing i did myself was change the air filter!!

  • jim sherman Feb 23, 2009

    CAR QUEST ALSO CHANGED THE FUEL CAP

  • jim sherman Feb 23, 2009

    I AM GOING TO CHANGE THE FUEL FILTER IN THE MORNING AND CLEAN THE UPPER SENSORS AND I WILL LET YOU KNOW THANKS FOR THE HELP. THE AIR FILTER WAS A CAR QUEST AS WELL AS THE GAS CAP

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The 171 means that you are running to lean on either air or fuel. Do you have any upgrades to the fuel or air system? 131 is the first oxygen sensor on your vehicle and that is typically right past the headers.

Posted on Feb 23, 2009

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  • Zachary Kloefkorn Feb 23, 2009

    it was a standard air filter or a K&N (or some other type)?

  • Zachary Kloefkorn Feb 23, 2009

    Was there any other information that you needed?

  • Zachary Kloefkorn Feb 23, 2009

    ok sounds good.

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