Engine Coolant Temperature Sensor: Removal

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Disconnect the ground cable from battery.

Fig 1: Disconnecting Ground Cable From Battery
Courtesy of SUBARU OF AMERICA, INC.
Drain engine coolant. Refer to DRAINING OF ENGINE COOLANT .
Disconnect the connector (A) from the engine coolant temperature sensor, and remove the engine coolant temperature sensor.

Fig 2: Locating Engine Coolant Temperature Sensor Connector
Courtesy of SUBARU OF AMERICA, INC.