Ford F8AZ-7F293-AA Automatic Transmission Gear Position Sensor

The Transmission Range (TR) sensor informs the PCM about gear positions and activates the back-up lights. If the engine starts in any gear other than Park or Neutral, the TR sensor might be faulty. To test, raise the vehicle, switch the ignition to On, and shift into Reverse. If back-up lights don't come on, detach the Shifter Cable, adjust the sensor until lights illuminate, then reattach the cable. If lights still don't come on, check the circuit and back-up lights. To replace the sensor, raise the vehicle, unplug the sensor's electrical connector, detach the Shifter Cable, and remove the sensor. Install a new sensor, ensure correct adjustment, tighten the screws, then lower the vehicle.