Got an 01 Supercrew with the 4.6 and keep getting an intermittent P0171 "Bank 1 Lean" code/Check Engine Light. Changed the fuel filter because it was nearly clogged, cleaned the MAF and IAC sensor and connectors and still get an occasional "Check Engine" light. I also run 1-2 cans of seafoam through the system every year.

What else can I look at before taking it to the shop? Thanks

 

Black electrical tape. Goes over the check engine light, and you never notice it!



Seriously though, i've given up on mine. Just see it and doesnt even bother me anymore.

 

How it run? Where's your warm at? First system to go thru is the PCV system when any bank tests positive for lean.
As long as your running Motorcraft plugs in, - your alright there. Make sure your IAT grommet and MAF O-ring are in good shape, - if you still have an o-ring that is lol.