Parts for your 2017 Subaru Forester-Air filter

2017 Subaru Forester air filter — purpose and servicing

The 2017 Subaru Forester is definitely fitted with an engine air filter. This is specified in the 2017 Forester Owner’s Manual under Maintenance and service (Air cleaner element), in the Subaru Service Manual via the Subaru Technical Information System (STIS), and in the Subaru genuine parts catalogue, all of which list a replaceable engine “air cleaner element” for both the 2.5‑litre FB25 and 2.0XT turbo engines. It sits under the bonnet in the air cleaner box on the intake side of the engine bay. There’s also a cabin (pollen) filter for the HVAC system, but this page focuses on the engine air filter.

The engine air filter’s job is simple but critical: it cleans the air the engine breathes. By trapping dust, sand and debris before they reach the intake tract, it protects the mass airflow sensor, throttle body and cylinders from abrasive wear. A healthy filter helps the Forester run smoothly, maintain fuel economy, and keep emissions in check—especially important for Aussie and Kiwi conditions where gravel roads and coastal air can load up a filter faster than city use.

Servicing is straightforward. The air filter should be inspected at every scheduled service. As a practical rule in Australia and New Zealand, plan on replacement about every 30,000–40,000 km or 2–3 years, and sooner if the vehicle regularly sees dusty roads, towing, or off‑bitumen trips. If it looks dark and clogged when held up to a light, replace it. Always make sure the sealing gasket sits clean and flat in the air box to prevent unfiltered air bypass.

Signs the filter may be past its best include sluggish acceleration, higher fuel use, or excessive induction noise. A very dirty element can also contribute to mass airflow sensor contamination, leading to rough running or a check engine light.

• Pop the bonnet and unclip/unbolt the air box lid.
• Lift the lid, slide the old panel filter out, and wipe out any leaves or dust in the housing.
• Install the new filter in the same orientation, refit the lid, and secure the clips/fasteners.

While sorting the engine air filter, it’s a good time to ask about the cabin filter behind the glovebox. Keeping both fresh helps the Forester breathe easier and keeps everyone comfortable.

Technical sources referenced: 2017 Subaru Forester Owner’s Manual (Maintenance and service—Air cleaner element), Subaru Service Manual via Subaru Technical Information System (STIS)—Air cleaner/intake section, Subaru genuine parts catalogue—Air cleaner element listing for MY2017 Forester.

Popular questions about 2017 Subaru Forester air filters

How often should the engine air filter be replaced in Australia or New Zealand?

It should be inspected at every scheduled service, with many owners replacing around 30,000–40,000 km or 2–3 years. If you regularly drive on rural or dusty roads, bring that forward. Always follow the maintenance schedule in the owner’s manual and use driving conditions as your guide.

What type of air filter does the 2017 Forester use?

It uses a panel‑type paper air cleaner element inside the air box. Genuine Subaru and quality aftermarket options are available. Because trim and engine variations exist (2.5i vs 2.0XT), it’s best to match by VIN or engine code to ensure the correct element.

Can a dirty or oiled filter cause problems?

Yes. An overly dirty filter can restrict airflow and foul the mass airflow sensor, leading to poor fuel economy and drivability issues. Over‑oiled performance filters, if not maintained correctly, can also contaminate sensors. Using a quality, correctly specified dry panel filter and replacing it on time keeps the Forester happy and helps protect the engine and your warranty position.