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-   -   03 gmc yukon XL 5.3 (https://www.askmehelpdesk.com/showthread.php?t=321654)

  • Feb 24, 2009, 05:48 PM
    maxpinck1
    03 gmc yukon XL 5.3
    I have a 03 yukon xl with a 5.3, went the check engine light first came on the code was p0171 and p0174. I changed both of the pre o2 sensors, the check engine light went out and came back on after a week with a code of p0171. Changed the fuel filter, mass airflow sensor, air filter and add lucas fuel injector cleaner, the engine light went out for about 2 weeks. Now it is back on, I checked the operation of each injector according to the chilton manual, can anyone help me out?:mad:
  • Feb 24, 2009, 06:50 PM
    TxGreaseMonkey

    You've covered most of the bases. There could be a vacuum leak downstream of the MAF Sensor.

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