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 Answer

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 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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