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P0171 Ford - 2004 ford Taurus

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my 2004 Ford Taurus p 0171 system too lean combined with P 0174 what is the best things to do first

Vehicle: 2004 Ford Taurus v 6

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P0171 Fuel trim lean

Visual inspection, the number one reason for fuel trim lean are vacuum leaks , vacuum leaks are intake leaks that gets past the MAF (mass airflow) check the PCV and its hose the hose there tends to collapse,

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