Engine Coolant Temperature Sensor: Removal

1. Disconnect the ground terminal from battery sensor. Ref. to BATTERY
2. Drain engine coolant. Ref. to DRAINING OF ENGINE COOLANT , REPLACEMENT, Engine Coolant.
3. Disconnect the connector (A) from the engine coolant temperature sensor, and remove the engine coolant temperature sensor.

Fig 1: Locating Engine Coolant Temperature Sensor Connector

Courtesy of SUBARU OF AMERICA, INC.