Mechanics

HUMMER H2 CHECK ENGINE LIGHT PROBLEM

2003 Hummer H2 • 69,000 miles

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?
AD
Avatar
Guest
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.

Wrenchtech
Dec 31, 2012.


AD