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JerryG, Mechanic
Category: Car
Satisfied Customers: 47
Experience:  over 5 years experience in late model repair, 2000 to 2009
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what do error codes P0171 and P0174 mean on a F150 Ford pickup

Resolved Question:

what do error codes P0171 and P0174 mean on a F150 Ford pickup truck?
Submitted: 8 years ago.
Category: Car
Expert:  JerryG replied 8 years ago.

P0171 is system to lean bank 1

P0174 is system to lean bank 2


I would suggest looking for air leaks, and checking your fuel pump and injectors. All these can lead to a lean system.

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Customer: replied 8 years ago.
Already knew it was lean and checked the hoses, is not an air leak, need to know what else could cause the problem such as dirty sensor and or leaking gasket.