2006 GMC Envoy Repair Question
Topics covered: Fuel pressure, Sensor.
Mileage: 80,000 miles.
Mileage: 80,000 miles.
Asked on November 23, 2011
2006 gmc envoy code po171
Won't pass Texas vehicle inspection with code po171. Have replaced the MAF, what else could be wrong?
Asked by claytitus1Answer
Replied on November 23, 2011
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.
