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1999 Ford Explorer Question: What is code PO174 and PO171?

 

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Visitor, 4.0L V6, Alpharetta, GA, November 29, 2010, 13:10

CHECK ENGINE light comes on. When this happens I get code(s)PO171 andPO174

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  • Medium-star Best Answer
    November 29, 2010, 13:42
     Master

    OBD II Code P0171 and P0174 = Fuel System Too Lean (Bank 1 or 2).

    There is very nice information about these codes in the RepairPal Encyclopedia; http://repairpal.com/OBD-II-Code-P0171-and-P0174

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  • Answer #2

    November 29, 2010, 17:48
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     Journeyman

    System too lean bank one and two, likley vacuum leak.

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  • Answer #3

    November 29, 2010, 22:00
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     Master

    Think intake manifold o-rings...if it's a 4.0L SOHC engine.

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