How do I fix PO171 System too Lean?

Tiny
ANONYMOUS
  • 1999 BUICK PARK AVENUE
  • 20,000 MILES

How do I fix PO171 (System too Lean)?

Saturday, October 20th, 2012 AT 9:08 PM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
  • 25,554 POSTS

Bank 1 lean.

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

Roy

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Saturday, October 20th, 2012 AT 9:13 PM

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