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