The engine air filter is located above the engine and filters the incoming combustion air for the engine. These should be checked every oil change and depending on where and how you drive they should be replaced about every other to every third oil change or else bad gas mileage and poor engine performace will occur.
The cabin air filter removes dust and pollen from the air entering the interior of the car through the heating and air conditioning system when the control is set to "fresh air" or "outside air". This is less critical but will eventually be clogged and will need changing.
Also normally they are different styles of air filter so a different type for each one, your owners manual should tell you the types.
There is no Power Steering Filter on a 2002 Subaru Legacy/Outback.
The Subaru Outback fuel filter is located inside of the fuel tank. Changing the fuel filter can be very costly and time-consuming.
It's on the right front side of the engine and accessible from under the car.
Bottom of the engine near the front. It points straight down.
where would you find out if the Air Conditioner filter is blocked on a 2005 Subaru Outback
Top front of engine, beside Oil Pump, right above Oil Filter.
I found no mention of a power steering filter in the owner's manual or in the service manual for Outback.
Top front of engine, beside Oil Pump, right above Oil Filter.
There should be a black box located on the left, inside your engine bay, mine's made out of plastic, your air filter should be located in there.
http://www.cars101.com/subaru/airfiltration.html#00-04legacy
On my 2001 Subaru Outback Wagon H6-3.0, it's on the driver side(L/H), in front of the wheel well, hidden behind the fog light...
The oil filter on the 2.5 engine is located on the underside of the engine on the passenger side. Find the oil plug, look up and to the right, above the plastic splash guard, a bit toward the front of the engine.