The shift interlock has failed, the most common issue is from a poor connection at the brake pedal position sensor. I t became so common the factory issued a Technical Service Bulletin on it. It can also be the solenoid or cable.
BRAKES - STOPLAMPS INOPERATIVE - SERVICE
REPAIR KIT FOR BRAKE PEDAL POSITION
SWITCH WIRING CONNECTOR
ELECTRICAL - TRANSMISSION SHIFT INTERLOCK
INOPERATIVE - SERVICE REPAIR KIT FOR BRAKE
PEDAL POSITION SWITCH WIRING CONNECTOR
1998-2002 CROWN VICTORIA
1998-2002 TOWN CAR
1998-2002 GRAND MARQUIS
The Brake Shift Interlock may be inoperative on some vehicles, not allowing the operator to move the shift lever from the Park position. Stop Lamp operation may also be affected. This may be caused by a deformed Brake Pedal Position Switch
Restore Brake Pedal Position Switch
operation by installing an updated electrical connector and pigtail.
Refer to the following Service procedure for details.
Try your brake lights if they don't work replace brake switch under pedal also try turning key to run but don't start shift into netural if you can and start. But you won't have brake lights If this helps please rate it thanks
Read more: 2000 Lincoln Town Car. Can not shift out of park. Foot on - JustAnswer http://www.justanswer.com/ford/33bv5-2000-lincoln-town-car-not-shift-park-foot.html#ixzz1hU1NdKNs