2000 Pontiac Montana diagnostic trouble code

2000 PONTIAC MONTANA
160,000 MILES • 6 CYL • FWD • AUTOMATIC
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JUNE1512
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  • 1 POST
I got this code on my diagnostic P0171 System too Lean (Bank 1) what does it mean? also i am losing a lot of fuel lately ,is it because of htis error? autozone told me that it means that one of my o2 sensor is bad ,but how do i tell hwich one out of the two
Mar 5, 2009 at 5:17 PM
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RASMATAZ
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Youi have a lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)
Mar 5, 2009 at 5:50 PM