Engine Code: P0171 on 1999 Ford Contour

What are the possible causes of the code?

Asked by for the 1999 Ford Contour
The OBD II P0171 means the Fuel System is too Lean (Bank 1). Your vehicle's computer registered a fault in the emission system. It detected abnormal levels of oxygen in the exhaust. For much more information please refer to this very interesting article in the Encyclopedia; http://repairpal.com/OBD-II-Code-P0171-and-P0174
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