2003 GMC Envoy code P0172

Tiny
BUCKSFAN
  • MEMBER
  • 2003 GMC ENVOY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 90,000 MILES
Is this an injector problem, I also have a p0340 which talks about a sensor.
Wednesday, July 15th, 2009 AT 7:48 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
2003 GMC Envoy code p0172

Rich running condition could be caused by the following:

Bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
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Wednesday, July 15th, 2009 AT 7:59 PM

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