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check engine light

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Ford >> Ford Trucks, Ford Vans & Ford SUV's >> Ford Expedition >> check engine light

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check engine light - 8/5/2008 7:26:23 PM

fitter1974

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Joined: 9/18/2007
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check engine light on in my 98 expy code reads as po171 system to lean(bank 1) just wondering if anyone can help me with this problem and what it might be, an o2 sensor? Thanks

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RE: check engine light - 8/6/2008 10:23:21 PM

J.A.F.E.

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Joined: 7/20/2008
Status: offline

It is a vacuum leak. If you are lucky it is just a vacuum line or connector. More likely it is the upper or lower intake gaskets - these engines have a history of intake gasket leaks.

(in reply to fitter1974)