2008 Subaru Impreza Owner's Manual - Page 335

Maintenance and service 11-19 to the top of the air cleaner case. cover and case with a damp cloth and install a new air cleaner element. Spark plugs 3. Unsnap the two clips holding the air cleaner case cover. 6. To install the air cleaner case cover, insert the three projections on the air cleaner case cover into the slits on the air cleaner case and then snap the two clips on the air cleaner case cover. It may be difficult to replace the spark plugs. It is recommended that you have the spark plugs replaced by your SUBARU dealer. The spark plugs should be replaced according to the maintenance schedule in the "Warranty and Maintenance Booklet". CAUTION . When disconnecting the spark plug cables, always grasp the spark plug cap, not the cables. . Make sure the cables are replaced in the correct order. - CONTINUED - 4. Open the air cleaner case cover and remove the air cleaner element. 5. Clean the inside of the air cleaner