PULLED CODE P0171 FROM SYSTEM.FOUND FRONT OXYGEN SENSOR TO BE BAD.REPLACED OXYGEN SENSOR AND ROAD TESTED. DURING ROAD TEST LONG TERM FUEL TRIM WAS GOING TO 14 NEGATIVE AND AIR FLOW WAS AT 1.6 GRAMS PER SECOND.TRACED FAULT TO DEFECTIVE AIR MASS METER.REPLACED AIR MASS METER AND ROAD TESTED.ALL NUMBERS ARE GOOD AND NO CODES RETURNED.
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