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How to Change a Car Air Filter?
Updated Cars & Driving
Engine air filter vs cabin air filter
| Engine air filter | Cabin air filter | |
|---|---|---|
| What it filters | Air going into the engine | Air coming through the vents into the car |
| Location | Large black box near the top of the engine bay | Usually behind the glovebox |
| Replacement interval | Every 12,000–15,000 miles (about once a year) | Every 15,000–25,000 miles (or yearly) |
| Tools needed | Usually none, just clips or screws | Usually none, glovebox opens by hand |
This guide covers the engine air filter, since that's what "car air filter" usually means; the cabin filter swap is similar in spirit but a different location, covered below.
What you need
- A new air filter that matches your car (check your owner's manual or an auto-parts lookup)
- Possibly a screwdriver, depending on the housing
Engine air filter — step-by-step
- Turn off the engine and pop the hood.
- Find the air filter box. It's usually a large black plastic box near the top of the engine, with a big hose leading out of it.
- Open the housing. Undo the metal clips, or remove the screws/clamps holding the lid on.
- Remove the old filter. Lift it out and notice which way it faces — take a photo if you're unsure, since installing it backward reduces airflow and filtration. Note how dirty it is; a filter clogged with dirt and leaves is due for replacement.
- Clean out the box. Wipe out any leaves or debris sitting in the bottom of the housing.
- Insert the new filter. Place it in the same orientation as the old one (the rubber sealing edge should seat properly against the housing).
- Close it up. Reattach the lid and re-clip or re-screw it, making sure it's sealed. Shut the hood.
Cabin air filter — quick version: open the glovebox, remove any stops or clips holding it fully open (check your manual — some just need squeezing the sides inward to drop down), slide out the old filter from its slot, note the airflow-direction arrow, and slide in the new one the same way. No tools needed on most cars.
Which way does the filter face? Both engine and cabin filters usually have an arrow printed on the frame showing the direction of airflow — install with the arrow pointing toward the engine or the cabin (the direction air should flow), not backward.
Can I change it myself? Yes, both filters are designed for DIY replacement — no special tools or mechanical skill required, just locating the housing and matching the orientation.
How often: engine filters need replacing every 12,000–15,000 miles (about once a year); cabin filters every 15,000–25,000 miles or yearly, sooner in dusty conditions or if you notice reduced airflow or odors from the vents.
Signs your engine air filter needs replacing sooner: reduced fuel economy, a slight loss of acceleration power, or (in older cars without modern fuel injection) a puff of black smoke on startup can all point to a clogged filter restricting airflow — these are worth acting on even if you haven't hit the mileage interval yet.
OEM vs aftermarket filters: an OEM (manufacturer-brand) filter is sized to match your engine's exact specifications and airflow needs; a quality aftermarket filter usually performs the same for regular driving, but if your car has a performance or turbocharged engine, checking that an aftermarket filter's airflow rating matches spec is worth the extra minute before buying.
Nearby questions in this topic include How to Check Engine Oil? and How to Check Oil in a Car?.
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