OBD2 adapter and Forscan.

 

Thanks. Hopefully ford will do it for me.

 

I doubt they will. Same reason why they instruct you to run at max psi all the time. Liability. Even forscan pops up a warning about not setting it lower than the setting on the door placard. You're gonna have to do this one yourself.

 

You should chalk new tires to set the correct unloaded air pressure. If you run the door sticker pressure all the time your tires, especially the rears, balloon, or convex, and wear the center treads faster. It doesn't really work for used tires, as the tread has already worn to the air pressure is been run at. With old tires, to even the tread and find the best pressure, you can measure tread depth across the tire, if center depth is shallower than the edges, lower pressure to concave the tire. If the center tread is deeper, raise pressure to convex the tire.

How to chalk a tire :
https://www.intercotire.com/using_ch...etermining_psi