2006 GMC ENVOY CODE PO171

  • Tiny
  • claytitus1
  • 2006 GMC Envoy
  • 80,000 miles

Won't pass Texas vehicle inspection with code po171. Have replaced the MAF, what else could be wrong?

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Wednesday, November 23rd, 2011 AT 4:21 PM

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  • Tiny
  • JDL
  • Expert
  • 16,289 posts

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.

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Wednesday, November 23rd, 2011 AT 8:24 PM

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