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Q: What is code PO174 and PO171? on 1999 Ford Explorer

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CHECK ENGINE light comes on. When this happens I get code(s)PO171 andPO174
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OBD II Code P0171 and P0174 = Fuel System Too Lean (Bank 1 or 2).

There is very nice information about these codes in the RepairPal Encyclopedia; http://repairpal.com/OBD-II-Code-P0171-and-P0174
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