1999 Pontiac Montana code p0171

1999 PONTIAC MONTANA
115,000 MILES • 6 CYL • FWD • AUTOMATIC
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MAEGROTH
  • MEMBER
  • 2 POSTS
Hi, My service engine soon light is on one day and off another but I dont notice the van running bad. I ran a scan on the code and it came up p0171 system too lean. What am I looking for to fix this problem?
Jun 13, 2009 at 8:25 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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JDL
  • CAR REPAIR CONTRIBUTOR
  • 16,098 POSTS
Hello, I'd want to see what the 02 sensor is doing? Drive the system rich and see if the 02 reading goes rich. If it does, the sensor may be ok and something is causing the system to go lean, fuel--vacuum leak, something.
Jun 13, 2009 at 9:04 AM
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