Parts for your 2017 Subaru Legacy-Air filter

2017 Subaru Legacy engine air filter — what it does and when to replace it

Yes, the 2017 Subaru Legacy absolutely uses an engine air filter. Subaru’s own technical literature confirms it: the Owner’s Manual describes the “air cleaner element” in the air cleaner box under the bonnet, the Service Manual covers removal/installation, and the Warranty & Maintenance Booklet schedules periodic inspection and replacement (typically replace around 48,000 km under normal conditions, with more frequent service in dusty use). Those factory sources make it clear the air filter is a normal, serviceable item on all 2017 Legacy petrol variants.

The air filter’s job is simple but critical: it cleans the air your boxer engine breathes. By trapping dust, sand and pollen before they reach the mass air flow sensor, throttle body and cylinders, it helps the Legacy run smoothly, keep fuel economy in check, and protect the engine from premature wear. A fresh filter also helps maintain crisp throttle response and reduces intake noise harshness.

For everyday driving, it’s smart to inspect the filter at every service (about every 10,000–12,500 km or 12 months in AU/NZ schedules) and replace it about every 48,000 km. If the car sees unsealed roads, coastal air, farm tracks or bushfire smoke, shorten that interval — think 15,000–24,000 km, or whenever it looks dirty.

• Where it lives: inside the air cleaner box on the left-hand side of the engine bay (under the bonnet). Flip the clips, lift the lid, and the element lifts out.
• What to look for: heavy darkening, visible dust build-up, oily contamination, torn pleats, or a musty smell. Any of these warrant replacement.
• What to avoid: blasting with compressed air or washing paper elements — that can damage fibres. If using a reusable oiled filter, don’t over-oil, excess oil can foul the MAF sensor.

Choosing a quality, OEM-spec paper element is a safe bet for Aussie and Kiwi conditions. Make sure the sealing lip sits true in the airbox, the lid latches squarely, and the intake snorkel is free of leaves. If the Legacy feels doughy off the mark, idles roughly, or drinks more fuel than usual, a clogged filter is an easy first check.

A few minutes under the bonnet with the right filter keeps the 2017 Legacy breathing easy and helps the engine last the distance.

Popular questions

How often should the 2017 Subaru Legacy engine air filter be replaced?
Subaru’s maintenance schedule calls for regular inspection and replacement around 48,000 km under normal use. In Australia and New Zealand, where unsealed roads and dust are common, many workshops recommend inspecting at each service and replacing as early as 15,000–24,000 km if conditions are harsh.

Is the engine air filter the same as the cabin filter?
No. The engine air filter protects the engine and sits in the airbox under the bonnet. The cabin (pollen) filter cleans the air inside the car and lives behind the glovebox. They do different jobs and have different service intervals.

Where exactly is the engine air filter on a 2017 Legacy?
It’s in the air cleaner box on the left side of the engine bay. Release the spring clips, tilt the lid back and the rectangular filter lifts straight out. Always refit with the pleats facing the airflow and the seal seated evenly.