2006 GMC Envoy code PO171

CLAYTITUS1

MEMBER
2006 GMC ENVOY
80,000 MILES

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

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

1 Reply

JDL

MECHANIC
16,098 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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