How to replace a 2019 Subaru Forester engine air filter.

Why it deserves attention.

The filter protects the intake from dirt. A damaged element or a poorly sealed housing can leave a path around the filter, so installation matters as much as buying the right part.

When should you check it?

Use the maintenance schedule for your exact vehicle and driving conditions. Inspect the element and seal during service. A damaged filter, heavy contamination, or an overdue scheduled replacement calls for attention. A filter change alone is not a diagnosis for rough running or a check-engine light.

Get ready

What you need.

See the process

Watch the video.

Watch the two clips, filter seating, and lower tabs. The creator labels a broader year range; this written tutorial is scoped to the 2019 US-market 2.5L Forester.

2019-2025 Subaru Forester Engine Air Filter Replacement · Mechanical Malarkey

Preparation

Before you start.

• Park on level ground, select Park, set the parking brake, and switch the engine off. Let hot underhood parts cool.
• Keep the engine off whenever the airbox is open. Do not put hands near cooling fans or allow debris into the clean intake.
• Watch the walkthrough first. If your housing differs, stop and check the instructions for your actual intake.

The lesson

Step-by-step instructions.

1. 01

   Open and support the hood.

   Pull the hood release in the driver footwell. Release the safety catch under the front edge, raise the hood, and secure its support before reaching into the engine bay.

2. 02

   Find the airbox and release its clips.

   Match the rectangular housing to the video. Release the two retaining clips. Ease the housing apart just enough to reach the element without pulling on wiring or the intake hose.

3. 03

   Lift out the old filter.

   Note its position before removal. On the demonstrated housing, the paper element faces toward the front of the vehicle, with its rubber edge between the two airbox halves.

4. 04

   Check the housing and replacement.

   Inspect the sealing area and remove loose debris from the dirty side with a shop vacuum. Keep dirt out of the clean outlet. Compare the old and new elements. Do not wash or oil a disposable paper filter.

5. 05

   Seat the new element.

   Set the replacement in the same position, checking that its seal sits evenly around the full perimeter. It should fit without crushing a corner or bending the housing.

6. 06

   Engage the lower tabs and close the clips.

   Locate the lower housing tabs before bringing the halves together. Engage them, align the housing, and secure both clips. If the case will not meet evenly, reopen it and correct the filter or tab position.

Common mistakes to avoid.

• Clipping the top shut while the lower tabs remain outside their slots.
• Pinching the filter seal, forcing the wrong element into place, or leaving a gap along the housing.
• Treating an air filter as a cure for a warning light or drivability fault without diagnosis.

Finish the job

Final checks.

• Both clips are secure, the lower tabs are engaged, and the housing seam is even.
• No tools or loose debris remain under the hood. Close and latch the hood fully.
• Record the date and mileage. Follow the applicable Subaru maintenance schedule and driving-condition notes rather than using this tutorial as a replacement interval.

How UpKeep approaches the work.

For a filter service, UpKeep confirms fitment, checks the element and housing, removes accessible loose debris, and checks the seal and clips after installation. A warning light or rough-running concern is reviewed separately.