2006 gmc envoy code po171

2006 GMC ENVOY
80,000 MILES
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CLAYTITUS1
  • MEMBER
  • 1 POST
Won't pass Texas vehicle inspection with code po171. Have replaced the MAF, what else could be wrong?
Nov 23, 2011 at 4:21 PM
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JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
I'd want to look at the 02 sensor for bank 1, see if it is showing lean. Richen the system, see if system will go rich. Use a gage and check fuel pressure. You may have to do an injector balance test.
Nov 23, 2011 at 8:24 PM
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