2006 Trailblazer Check Engine Light - code PO171
2006 Trailblazer Check Engine Light - code PO171
4.2 L engine has no running issues. Light comes on for a couple of days then goes off for a day or two, then comes back on. Usually comes back on when in stop and go traffic. Code PO171- System Too Lean Bank 1. Truck has 245,000 miles.
Re: 2006 Trailblazer Check Engine Light - code PO171
P0171 lean is usually caused by a vacuum leak. There is a common problem on the 4.2L described here...
GM 4.2L P0171 Lean Code.
That will usually give you some driveablilty problems though.
If you do not find a vacuum leak, then you may be getting some bad gas. High alcohol will give a lean code depending on the percentage and driving conditions. You would need a fuel composition test to determine that.
Another possibility is just a bad oxygen sensor.
GM 4.2L P0171 Lean Code.
That will usually give you some driveablilty problems though.
If you do not find a vacuum leak, then you may be getting some bad gas. High alcohol will give a lean code depending on the percentage and driving conditions. You would need a fuel composition test to determine that.
Another possibility is just a bad oxygen sensor.
-
- Similar Topics
- Replies
- Views
- Last post
-
- 1 Replies
- 16825 Views
-
Last post by carriedi
Fri May 15, 2020 6:58 pm
-
-
New post 2006 Suburban 4wd Z71 Service stability code C0131
by mike6w » Sun Nov 01, 2015 8:17 am » in Chevy Suburban - 8 Replies
- 14955 Views
-
Last post by carriedi
Tue Nov 03, 2015 11:43 am
-
-
-
New post code P0106 Blazer ENGINE RUNNING HEAVY
by DARKHARRIS » Tue Jan 05, 2016 1:29 pm » in Chevy Blazer - 1 Replies
- 7184 Views
-
Last post by tech3
Tue Jan 05, 2016 5:10 pm
-
-
-
New post Smog Test/Service Engine Light
by chevyfan » Thu Nov 06, 2014 4:38 pm » in Chevy S-10 Pickup - 3 Replies
- 7327 Views
-
Last post by carriedi
Sat Nov 08, 2014 7:03 pm
-
-
- 1 Replies
- 18629 Views
-
Last post by carriedi
Mon Aug 10, 2020 6:10 pm