How to Change Subaru Cabin Air Filter: Easy DIY Replacement

Replacing your Subaru’s cabin air filter takes about 5–10 minutes and usually needs no tools. Just grab a new filter and locate the access panel behind the glove box. But here’s the part most guides skip: on many Subaru models you do not have to remove the glove box completely. Look for a small separate door first – it’s often hiding in plain sight and can save you time and hassle.

Quick check before you start

Run through these five items before you get your hands dirty.

• Do you know your Subaru’s model year? The location and access method changed around 2008–2009 on most models. Newer cars (roughly 2010 and later) almost always have a dedicated access door.
• Do you have the right filter? Subaru part numbers vary by generation. For example, a 2015 Outback uses filter #72880FJ00A, while a 2020 Forester uses #72880FL00A. A 2017 Impreza takes #72880FJ00A as well, but a 2012–2016 Impreza uses #72880FG00A. Check the owner’s manual or look up your VIN at a parts counter.
• Can you spot the access panel? Open the glove box and look at the back wall. If you see a rectangular plastic cover (about 8 x 8 inches) with two tabs or a thumb screw, that’s your door. If not, you’ll need to release the glove box stops.
• Is the glove box empty? Remove everything – a loose pen or wallet can fall behind the panel and get stuck in the blower motor. On some models, a fallen credit card can jam the fan and require a full blower removal to extract.
• Do you know which way the air flows? Most aftermarket and OEM filters have an arrow that must point down (toward the fan) or toward the passenger seat (toward the blower inlet). Installation backwards will still fit but cuts airflow by half. On a 2018 Outback, the arrow should point toward the passenger seat; on a 2009 Forester, it should point down.

Find the access panel – it’s not always the glove box

Subaru started using a separate cabin filter access door around 2009–2010. On models like the 2010+ Outback, 2009+ Forester, 2012+ Impreza, 2013+ Crosstrek, and 2015+ WRX, you’ll see a simple rectangular cover on the back of the glove box cavity. No tools needed – just press the tabs and pull it off.

If your Subaru is older than that (2008 or earlier), or if you don’t see a separate door, you’ll need to drop the glove box fully. That means pinching the side stops (usually two plastic arms) and letting the glove box swing down. On a 2005 Legacy, for example, you have to reach behind the glove box and compress both sides simultaneously. That’s the harder route – which is why checking for the separate door first saves frustration.

Model-year access type reference

Subaru Model	Years with separate access door	Years that need glove box drop
Outback	2010–2024	2000–2009
Forester	2009–2024	2003–2008
Impreza (non-WRX)	2012–2024	2002–2011
Crosstrek	2013–2024	N/A (all have separate door)
WRX / WRX STI	2015–2024	2002–2014
Legacy	2010–2024	2000–2009
Ascent	2019–2024	N/A (all have separate door)
BRZ	2013–2020	N/A (all have separate door)

Note: Some 2009 model-year Foresters built mid-year may have the separate door, while early 2009 builds still require a glove box drop. Check your build date on the driver’s door jamb sticker.

Step-by-step replacement

1. Open the glove box and empty it.

Take out everything – owner’s manual, registration, pens, whatever. A spare pen cap that falls behind the panel can rattle for months. On models with a glove box light, the bulb can pop out if you yank the box; be careful with the wiring.

2. Locate the access cover.

If you see a plastic square with two tabs (or a single thumb screw), that’s your target. On models with a separate door, skip the glove box release. On models without a door, pinch the glove box stops on both sides to lower the entire box. On a 2006 Legacy, the stops are small plastic arms that you press inward; on a 2007 Forester, they are U-shaped hooks that need to be pushed upward.

3. Remove the cover.

Press the tabs inward or turn the thumb screw 90° (usually counterclockwise). The cover pulls straight off. Set it aside – don’t drop it behind the dashboard. If the tabs feel stiff, use a flathead screwdriver wrapped in tape to gently push them.

4. Pull out the old filter.

It will probably be dusty and may have leaves or debris wedged into the pleats. Note its orientation before you yank it. The old filter’s arrow (if still visible) shows the correct airflow direction. If the arrow is worn off, look for a small arrow printed on the filter frame or a “TOP” marking. On a 2015 Outback, the old filter often has brown discoloration on the clean side if it was installed backwards.

5. Insert the new filter.

Slide it in with the airflow arrow pointing in the same direction as the old one. Typically that means down or toward the passenger seat. Do not force it – if it doesn’t slide easily, the arrow is probably backward. For a 2017 Impreza, the filter should slide in with the arrow pointing toward the passenger side; if it bulges, flip it.

6. Reinstall the cover.

Snap it back on (or turn the thumb screw) until it clicks. If you dropped the glove box, push it back up until the stops engage. Test the glove box by opening and closing it once. On some models (e.g., 2019 Ascent), the cover has a small alignment notch that must line up with a slot in the housing.

Where people get stuck

• Filter installed backward. The most common mistake. A backward filter still fits but the cabin fan sounds louder and air output drops noticeably. On a 2017 Impreza, installing the arrow pointing up reduces airflow by about 40%. On a 2012 Outback, a backwards filter can cause a whistling sound at high fan speed.
• Broken glove box stop. Plastics get brittle with age. If you have to drop the glove box, use gentle pressure – never yank. A broken stop means a floppy glove box that won’t stay closed. Replacement stops cost around $5 at a dealer. On a 2004 Legacy, the stops are often the first plastic part to break; order two extras.
• Cover won’t snap back. The access cover tabs can break if you force them at an angle. Line up the tabs squarely and press firmly. If a tab breaks, you can use a small piece of tape as a temporary fix, but order a new cover (about $8–12). On a 2016 Crosstrek, the cover is especially prone to cracking if twisted.
• Wrong filter size. Aftermarket filters vary slightly in height. A filter that’s 1/4 inch too tall will bulge the cover and let unfiltered air bypass. Stick with an OEM filter or a brand like FRAM, Bosch, or Wix that lists your exact Subaru model and year. For a 2011 Forester, a “universal” filter from a generic brand may be too tall by 3/8 inch.

Filter types: standard vs. activated carbon

Most Subarus come from the factory with a standard pleated paper filter that traps dust and pollen. If you live in an area with heavy traffic, smog, or odors, consider using an activated carbon filter. The carbon layer absorbs gases, exhaust fumes, and mildew smells.

• Standard filter: $10–$15. Lasts 12 months / 12,000 miles. Good for most conditions.
• Activated carbon filter: $15–$25. Lasts 12–18 months. More restrictive to airflow? In practice, the difference is negligible on a Subaru’s blower motor; most owners report cleaner air.
• HEPA-grade filters: $20–$30. Trap particles down to 0.3 microns. Overkill unless you have severe allergies. Performance brands like K&N also sell washable cabin filters ($40–$50), but they require periodic cleaning and drying.

Which should you pick? If you drive in city traffic or notice diesel truck exhaust inside the cabin, get the carbon version. If you’re on a strict budget or change filters every 6 months, standard paper is fine.

Where to buy and what to expect in cost

• Subaru dealer: $20–$30 for OEM filter. Best fit guarantee, but the highest price.
• Auto parts stores (Advance Auto, AutoZone, O’Reilly): $10–$20 for brands like FRAM, Bosch, STP, or MicroGard. Check the fitment guide on the back of the box. Often the store employees can look up the exact part.
• Online (Amazon, RockAuto, SubaruPartsDealer): $8–$25. RockAuto often has the lowest prices but shipping adds time. Stick to well-known brands: WIX, Purolator, Bosch, ACDelco.

Dealer labor to replace a cabin filter is typically $50–$75 (parts and labor). Doing it yourself saves $30–$50 and takes less than 15 minutes.

When to stop DIY and call a pro

If you break a glove box stop while dropping the box, stop and assess. A broken stop means the glove box won’t stay closed. You can still finish the filter swap, but the box will sag. That’s a $5 part and a five-minute swap at the dealer. Driving with a dangling glove box isn’t dangerous, but it’s annoying and can rattle. If you snap an access cover tab and can’t get the cover to seat firmly, stop – unfiltered air will bypass the filter and dust will enter the cabin. A temporary piece of tape works for a day, but order the replacement cover before driving any distance on dusty roads.

If your Subaru is a 2008 or earlier model and you can’t get the glove box to drop after a few tries, park it and ask a shop to do it. Forcing brittle 15-year-old plastic can cause damage that costs more than the $50–75 a dealer would charge for the whole job.

Confirm it’s working

After the new filter is in, start the engine and turn the cabin blower to high. Switch between recirculation (often a button with a car icon and arrow) and fresh air. You should immediately notice cleaner-smelling air and less fan noise if the old filter was clogged.

If you hear a rattle or flapping sound, the filter may be loose or the cover isn’t seated. Shut off the blower and check the cover’s fit. If airflow feels weak after the fix, the filter is almost certainly upside down – pull it out, flip it, and reinstall. A correctly installed filter should let the fan push air freely without straining.

That’s it. The whole job runs about five minutes on cars with a separate access door, and maybe ten on older models that need a glove box drop. Your lungs (and your Subaru’s HVAC system) will thank you.