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  1. C

    Can not get rid of PO171, PO174

    I'v done that and they come back. I'll give you a list of what I have done. Replace intake Check mass sensor Replace air and fuel filter Replace injectors Replace PCV valve and hose New spark plug and wire Reset com These are the codes from hell.
  2. C

    Can not get rid of PO171, PO174

    I have a 2003 Sporttrac with 115000 mls no matter what I do the codes come back. Any suggestion please.
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