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    poncho0723's Avatar
    poncho0723 Posts: 4, Reputation: 1
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    #1

    Mar 16, 2010, 03:46 PM
    Codes p0171 and p0174 System to lean bank 1 and 2?
    I have a 98 ford expedition and I have 2 codes P0171 and P0174 System to lean 1 and 2 can some body please help what this codes mean?

    Thanks
    kitch428's Avatar
    kitch428 Posts: 1,440, Reputation: 152
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    #2

    Mar 16, 2010, 04:19 PM

    That means both sides of your motor are sensing lean condition. I'd be checking for a vacuum leak.
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #3

    Mar 16, 2010, 06:46 PM

    Fairly common codes on Fords. Try cleaning the Mass Air Flow (MAF) Sensor:

    https://www.askmehelpdesk.com/cars-t...ml#post1377134
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