1999 Buick Park Avenue Fix Po171 System Too Lean

1999 BUICK PARK AVENUE
20,000 MILES
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How do i fix PO171 (System too Lean)?
Oct 20, 2012 at 9:08 PM
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ASEMASTER6371
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bank 1 lean.

could be a vacuum leak, low fuel pressure, pcv valve or bad mass air flow or map sensor.

Roy
Oct 20, 2012 at 9:13 PM
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