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View Full Version : Codes p0171 and p0174 System to lean bank 1 and 2?


poncho0723
Mar 16, 2010, 03:46 PM
I have a 98 ford expedition and I have 2 codes P0171 and P0174 System to lean 1 and 2 can some body please help what this codes mean?

Thanks

kitch428
Mar 16, 2010, 04:19 PM
That means both sides of your motor are sensing lean condition. I'd be checking for a vacuum leak.

TxGreaseMonkey
Mar 16, 2010, 06:46 PM
Fairly common codes on Fords. Try cleaning the Mass Air Flow (MAF) Sensor:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-8.html#post1377134