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2001 GMC Sonoma P0171 CODE 2001 GMC Sonoma 4.3

Tiny
LVMARK
  • MEMBER
  • 2001 GMC SONOMA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 109,000 MILES
MY SERVICE ENGINE SOON LIGHT COMES ON OCCASIONALLY AND HAS STORED THE CODE
P0171. I CAN, T FIND ANY VACUUM LEAKS AND THE VEHICLE HAS MULTIPLE OXYGEN SENSORS. FUEL
ECONOMY SEEMS TO HAVE DECREASED A BIT.
SHOULD I REPLACE THE OXYGEN SENSORS AND IF SO, WHICH ONES? THANK YOU
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Friday, June 25th, 2010 AT 1:31 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lean fuel condition could be caused by one of the following below:

1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.
6. Oxygen Sensor.
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Friday, June 25th, 2010 AT 2:13 PM

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