Ford 1999 Taurus Owner's Manual page 183

To move the shifter out of P (Park), the ignition
key must be turned to the ON position. This
vehicle is also equipped with the brake shift
interlock safety feature which prevents shifting the
transmission out of the P (Park) position without
the brake pedal being depressed if the key is in the
ON position.
To operate:
1. Start the engine.
2. Depress and hold the brake pedal.
3. Move the gearshift lever out of P (Park).
Your vehicle is equipped with a Brake Shift
Interlock safety feature. This feature prevents the
gearshift from being moved from the P (Park)
position until the brake pedal is depressed. This
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feature is active when the ignition is in the ON
position. If the gearshift lever CANNOT be moved
from P (Park) with the brake pedal depressed:
1. Turn the engine off and remove the ignition
key.
2. Apply parking brake.
3. Reinsert the ignition key and turn clockwise to
the first position.
4. Depress the brake pedal, move the gearshift
lever to N (Neutral) and start the engine.
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
Servicing Your Mark VIII chapter for instructions on
checking and replacing fuses.