HOW DO I FIX PO171 SYSTEM TOO LEAN?

1999 Buick Park Avenue

Tiny

Anonymous

October, 20, 2012 AT 9:08 PM

How do I fix PO171 (System too Lean)?

FOUND 162 RELATED QUESTIONS

1 Answer

Tiny

ASEMaster6371

October, 20, 2012 AT 9:13 PM

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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