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    maxpinck1's Avatar
    maxpinck1 Posts: 28, Reputation: 3
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    #1

    Feb 24, 2009, 05:48 PM
    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:
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Feb 24, 2009, 06:50 PM

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