Ford Vehicle Owner's Manual page 178

NOTE: Your vehicle is equipped with a
brake-shift interlock feature. This
feature prevents you from shifting
from P (Park) unless you have the
brake pedal depressed. (The ignition
must be in the ON position.) If you
cannot shift from P (Park) with the
brake pedal depressed:
1. Apply the parking brake.
2. Remove the key.
3. Insert the key and rotate one position
clockwise (ignition in the OFF position).
4. Apply the brake pedal and shift to N
(Neutral). (If the vehicle is shifted to P
(Park), you must repeat the previous steps.)
5. Start the vehicle.
If you need to shift out of P (Park) by using the
alternate procedure described above, it is
possible that a fuse has blown and that your
brakelamps may also not be functional. Please
refer to the chapter titled Servicing Your F-Series
in this Owner Guide for instructions on checking
and replacing fuses.
DO NOT DRIVE YOUR VEHICLE UNTIL
YOU VERIFY THAT THE BRAKELAMPS
ARE WORKING.
R (Reverse)
With the gearshift in the R (Reverse) position,
the vehicle will move backward. You should
always come to a complete stop before shifting
into or out of R (Reverse).
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RWARNING