2006 gmc envoy code po171

2006 GMC ENVOY
80,000 MILES
Avatar
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 8:21 AM
Advertisement
Avatar
JDL
  • ✓Experienced 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.
Nov 23, 2011 at 12:24 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle