CODE PO171

2006 GMC Envoy

Tiny

claytitus1

November, 23, 2011 AT 4:21 PM

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

FOUND 156 RELATED QUESTIONS

1 Answer

Tiny

JDL

November, 23, 2011 AT 8:24 PM

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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