FORD 2009 F-550 v.2 - Manual (Page 252)

4. Press and hold the brake pedal
for two (2) seconds, then release.
5. Turn the ignition to off—DO
NOT remove the key.
6. Cycle the ignition from off to on three (3) times ending in on. DO
NOT start the engine.
If the reset mode has been entered successfully, the horn will sound
once, the TPMS indicator
will flash and the message center will
display TRAIN LEFT FRONT TIRE.
If after repeated attempts to enter the reset mode, the horn does not
sound, the TPMS indicator
does not flash and the message center
does not display TRAIN LEFT FRONT TIRE, seek service from your
authorized dealer.
2009 F-250/350/450/550 (f23)
Owners Guide, 2nd Printing
USA (fus)
Tires, Wheels and Loading
252