Engine Oil Temperature Sensor: Removal

Disconnect the ground cable from battery.

Fig 1: Connecting/Disconnecting Battery Ground Cable
Courtesy of SUBARU OF AMERICA, INC.
Disconnect the connector (A) from the engine oil temperature sensor, and remove the engine coolant temperature sensor from the chain cover.

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