No Manual Low Gear
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2002 Mercury Grand Marquis, 2002 Lincoln Town Car, 2002 Ford Crown Victoria, 2001 Mercury Mountaineer, and 2001 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
Shift linkage, Transmission Range (TR) sensor, low/reverse clutch pressure, low/reverse band pressure, low line pressure, low Electronic Pressure Control (EPC) pressure, filter (plugged), valve body (No. 6 shuttle ball, manual valve, main regulator valve, low servo modulator valve), incorrectly tightened valve body bolts or reverse servo.