I need advice, I have a 1999 F 150 4.2 L I have recently had the check engine light come on and this is the only code running. P0174 which means bank 2 running lean. I have checked for vaccum leaks w/ no luck finding any. I have noticed a drop of about 15 to 20 miles per tank since the light has came on.
Any ideas? The truck runs and idles as smooth as it ever has which makes me lean away from a vacuum leak or a Bad injector. I may be wrong in my thinking though. I tested the pcv valve and it is working well.

 

og senser