Subaru 16546AA12A Element Air Cleaner

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The air filter is located inside a housing in the engine compartment. Separate the cover halves and remove the air filter element. Remove the bolt holding the rear half of the air filter case, then release the spring clips to access the filter element for 2004 and earlier non-turbocharged models. For all other models, loosen the intake hose clamp, then unlatch the clips to access the air filter element. Inspect the outer surface of the filter element. If it is dirty, replace it. If it is only moderately dusty, it can be reused by blowing it clean from the back to the front surface with compressed air. Because it is a pleated paper type filter, it cannot be washed or oiled. If it cannot be cleaned satisfactorily with compressed air, discard and replace it. While the cover is off, be careful not to drop anything down into the housing. Wipe out the inside of the air filter housing. Place the new filter into the housing, making sure it seats properly. The remainder of the installation is the reverse of removal.

You should inspect the outer surface of the filter element.