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?
Dec 31, 2012 at 12:10 PM
2003 Hummer H2 Check Engine Light Came On Took Auto Zone Two Codes Po171 Po174
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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.
Dec 31, 2012 at 12:20 PM
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