Parts for your 2021 Subaru Impreza-Air filter

2021 Subaru Impreza Air Filter — What it does and when to change it

The 2021 Subaru Impreza absolutely uses an engine air filter. Subaru’s MY2021 Impreza Owner’s Manual, factory service information and genuine parts catalogues all specify an engine air cleaner element for the 2.0‑litre FB20 petrol engine, with scheduled inspection and replacement procedures. So yes—this part is relevant, fitted from factory, and essential to the way the car breathes.

The engine air filter’s job is simple but crucial: it stops dust, sand and other nasties from entering the intake tract and cylinders while still letting in plenty of clean air. That protects the throttle body and sensors, keeps the combustion chambers tidy, and helps the Impreza deliver smooth performance and decent fuel economy. When the filter’s clogged, airflow drops, the ECU has to work harder to balance fuel trims, and the car can feel a bit doughy on take‑off while sipping more petrol than it should.

For Aussie and Kiwi conditions, it’s smart to have the air filter inspected at every regular service (typically around 12 months/12,500 km for many schedules here). Replacement is commonly needed around 30,000–45,000 km or 24–36 months, but that can be sooner if the car spends time on dusty roads or bush tracks. Under the bonnet, the filter sits in the airbox