Intake Side

WARNING: This page is about a different car, the 2013 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Remove the two mounting bolts securing oil return cover, and remove the oil return cover and gasket.
Remove the bolt securing oil flow control solenoid valve, and remove the oil flow control solenoid valve.

Fig 1: Identifying Oil Flow Control Solenoid Valve, Oil Return Cover, Gasket And Front Camshaft Cap
Courtesy of SUBARU OF AMERICA, INC.