Today my 2002 5.4L SuperCrew decided to throw a couple codes at me. So I pulled them with my Superchips tuner. I'm currently at 110K and running the stock tune. The codes were P1000 (monitor checks not complete, more driving required ), P0171 (sys too lean/bank1) & P0174 (sys too lean/bank2).

Does anyone know what these mean? Thanks in advance for the help.

 

Ten times out of nine it's the PCV elbow on the back of the throttle body on the 5.4's.

 

Don't worry about the 1000 code . 171 174 . The computer sees a lean condition . Start with looking for vac leaks , pcv elbow ? If no leaks , Then fuel filter . Ck fuel pressure after that . Ck mass air flow sensor also . Good luck !

 

Thanks Guys! I went out and looked, saw that the CAI came apart right after the Mass Air Flow Censor, so it wasn't reading any air coming through. I didn't notice that yesterday when I switched my tune back.

 

I love cheap and easy fixes!!!!!

Glad you got it.