Http://ww2.justanswer.com/uploads/fordguy4u/2009-09-24_191909_A1.pdf
is for p0300-p0306
and here is for the p0171
http://repairpal.com/OBD-Code-P0171-and-P0174
System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
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Thanks.
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