PCV Valve

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Check that the PCV valve has no deformation, cracks or other damages.
Check that air is discharged from (B) when air is blown into (A).

Fig 1: Checking Discharging Of Air In PCV Valve
Courtesy of SUBARU OF AMERICA, INC.
Check that air does not come out from (B) when air is blown into (A).

Fig 2: Checking Air Does Not Come Out From (B) When Air Is Blown Into (A)
Courtesy of SUBARU OF AMERICA, INC.