1999 Pontiac Montana code p0171

1999 PONTIAC MONTANA
115,000 MILES • 6 CYL • FWD • AUTOMATIC
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MAEGROTH
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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
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JDL
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  • 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