Subaru Genuine OEM Interior Cabin FilterNote: Check OEM filter and compare to photo above to confirm correct If the air coming out of your vents smells a little funnylike mildew or funkor if your windshield fogs up with the A C on, your Subaru may have a clogged cabin filter. Many manufacturers recommend replacing the cabin filter, or pollen filter, as part of its scheduled maintenance. What do they do? Cabin air filters trap foreign particles from outside air that are drawn in through your