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  1. S

    P0171 & P0174 Problem

    So here's the details: 1999 Ford Explorer 4x4 V6 OHV 148,000 Miles Oil changes every 3000 w/ synthetic oil; well taken care of truck K&N Air Filter about 40,000 miles ago; never been cleaned, soon, not that dirty. Fuel filter about 30,000 miles ago Oxygen sensors, plugs and wires last...
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