TR Sensor
WARNING: This page is about a different car, the 2015 Lincoln MKT. However, it is still accessible from the selected car via links, so may be relevant.
The TR sensor is located inside the transmission and indicates gearshift position to the PCM. The PCM uses that information to enable the starting system to start the engine in PARK or NEUTRAL. For additional information, refer to Automatic Transmission 6F50/6F55 or Automatic Transaxle Transmission 6F35 .