2004–2009 Mazda Mazda3
| Part Name | Part Number | Price | Buy |
|---|---|---|---|
| Cabin air filter two-piece set (Mazda BP4K-61-J6X or equivalent, e.g. AQ1116) | — | $34.00 |
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Follow these steps carefully
Park the Mazda3, turn the ignition off, and disconnect the negative battery terminal, because this job requires unplugging the fuse box under the passenger dash. Slide the passenger seat fully back to open up the footwell. Removing battery power protects the airbag and body electronics while the fuse box is out.
Video at 00:00
Lie down in the passenger footwell and look up under the glove box for the lower dash panels; release their clips and screws and pull the panels down. A trim tool helps release the plastic clips without breaking them. Set every panel and fastener aside in order so reassembly is straightforward.
Video at 00:00
You will now see the fuse and junction box mounted under the dash; carefully release each wiring connector by pressing its locking tab, and note or photograph where every connector goes. Undo the mounting bolts or clips holding the fuse box and lift it out of the way. This is the trickiest part of the job, so label connectors with tape if you are unsure.
Video at 00:40
Behind where the fuse box sat is a metal support frame held by several nuts, so remove them and slide the frame out. This frame is what blocks access to the filter door on the 2004-2009 Mazda3. Keep the nuts in a tray because they are small and roll away easily.
Video at 03:10
With the frame out, you can see the rectangular plastic filter access door on the HVAC box; remove its four Phillips screws and pull the door off. Shine a light inside to confirm you can see the pleated filter media. If the screws resist, make sure the screwdriver seats fully so the heads do not strip.
Video at 03:45
The cabin filter on this Mazda3 is a two-piece set that slides out in halves, so pull the first half out and then the second, keeping them level so dust does not spill into the housing. Study how they sat, noting which half was on top and which way the airflow arrows pointed. The old filters are usually gray and packed with debris.
Video at 04:55
Vacuum or wipe the empty housing slot to remove leaves and dust that fell in, then hold the new two-piece set next to the old one to confirm the sizes match. Slide the new halves into the housing in the same arrangement as the old ones, with the foam edge and airflow arrows oriented correctly. A mismatched orientation lets dirty air bypass the filters.
Video at 05:13
Reinstall the filter access door and its four screws, snugging them without overtightening the plastic. Refit the metal support frame and its nuts, then reconnect the fuse box, seating every wiring connector until its locking tab clicks. Double-check each connector against your photos before moving on.
Video at 05:30
Clip the under-dash panels back into place, making sure every clip and screw seats so nothing rattles while driving. Reconnect the negative battery terminal and tighten it securely. Start the Mazda3 and confirm that all dashboard functions, lights, and accessories work normally before driving.
Video at 08:52
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
2006–2009
2014–2018
2014–2018
2006–2009
2010–2013
2011–2013