Exhaust Side

Disconnect the ground cable from battery.

Fig 1: Disconnecting Ground Cable From Battery
Courtesy of SUBARU OF AMERICA, INC.
Remove the under cover. Ref. to REMOVAL , Front Under Cover.
Disconnect the connector (A) from the camshaft position sensor, and remove the camshaft position sensor from the chain cover.

RH side

Fig 2: Disconnecting Connector From Camshaft Position Sensor (RH Side)
Courtesy of SUBARU OF AMERICA, INC.
LH side

Fig 3: Disconnecting Connector From Camshaft Position Sensor (LH Side)

Courtesy of SUBARU OF AMERICA, INC.