2003 Hummer H2 Repair Question
Topics covered: Body, Check engine light, Engine.
Mileage: 69,000 miles.
Mileage: 69,000 miles.
Asked on December 31, 2012
Hummer H2 Body Problem
The check engine light came on and I took it to Auto Zone and two codes came up PO171 and PO174 System too Lean (Bank 1) what does that mean?
Asked by (pending member)Answer
Replied on December 31, 2012
It means just that. The system is extremely lean for some reason and the computer has reached it's limit in being able to compensate for it. Check carefully for vacuum leaks and any leaks in the intake between the MAF and throttle body.
