Your Mazda 3 has a cabin air filter behind the glove box. If you can't remember the last time you changed it, it's probably time. The lookup table below has the right OE part number for every Mazda 3 model year from 2004 to 2026, plus what a replacement should cost.
The Mazda 3 uses five different OE cabin air filter part numbers across model years 2004 to 2026. The filter sits behind the glove box, takes about 10 minutes to swap with no tools, and needs replacement every 12,000 to 30,000 miles.
Mazda 3 cabin air filter by year:
2004–2005: BP8P-61-J6X
2006–2009: BP4K-61-J6X
2010–2013: BBM4-61-J6X
2014–2018: KD45-61-J6X-9U
2019–2026: BDGF-61-J6X
Key facts:
Location: Behind the glove box on every Mazda 3 generation
Install time: About 10 minutes, no tools required
Replacement interval: 15,000 to 30,000 miles per Mazda; Filterbuy recommends 12,000 miles or once a year for U.S. driving conditions
Typical price: $18 to $38 for the filter itself
Filter type: HEPA-grade synthetic, with activated carbon options for odor control
Filterbuy builds HEPA-grade replacement cabin filters for every Mazda 3 model year in its U.S. factories. Factory-direct pricing, free U.S. shipping, and 75,000+ five-star reviews since 2013.
If you remember nothing else, remember these five.
5 OE part numbers cover every Mazda 3 from 2004 to 2026. Match your year in the lookup above.
Replace every 12,000 miles or once a year. Tighter than Mazda's 15,000–30,000 mile window. American air has changed.
10-minute DIY swap behind the glove box. Saves the $45–$66 in dealer labor that RepairPal estimates.
Cabin filters cut in-vehicle PM2.5 by ~30%. Peer-reviewed 2023 study in Environmental Science & Technology.
HEPA-grade filters have been built in our U.S. factories since 2013. Free U.S. shipping. 75,000+ five-star reviews.
Mazda revised the Mazda 3 cabin filter five times between 2004 and today. Match your year to the OE number below, and that's the filter you need.
| Mazda 3 Year | Mazda OE Part Number | Fits | Typical Price |
|---|---|---|---|
| 2004–2005 | BP8P-61-J6X | Sedan & Hatchback with A/C | $18–$32 |
| 2006–2009 | BP4K-61-J6X | Sedan, Hatchback, Mazdaspeed3 (07–09) | $18–$32 |
| 2010–2013 | BBM4-61-J6X | All Mazda 3 & Mazdaspeed3 trims | $19–$34 |
| 2014–2018 | KD45-61-J6X-9U | Sedan & Hatchback (shared w/ Mazda 6, CX-5) | $19–$36 |
| 2019–2026 | BDGF-61-J6X (also BDTS-61-J6X) | Sedan & Hatchback (shared w/ CX-30, CX-50) | $20–$38 |
Not sure what year you've got? The driver-side door jamb sticker has it, or your registration. (If you want to do it the proper way, the 10th character of your 17-digit VIN is the model year code.) Driving a Mazdaspeed3? Same filter as the Mazda 3 of the same year.
The cabin filter sits between the outside world and the air you breathe in your car. Outside air flows past the grille, through the filter, into the blower, and out the dash vents (heated, cooled, or just fresh). Same idea as the filter in your home HVAC, just smaller and easier to forget about.
A clean filter does the work you can't see:
Catches the bad stuff: dust, pollen, smoke, mold spores, exhaust, and brake dust.
Keeps your car air conditioning strong, because the blower doesn't have to push air through a clogged surface.
Protects the rest of your HVAC system from premature blower motor wear.
Small part, big job. The EPA reports that indoor air, including the air inside your cabin, can be 2 to 5 times more polluted than outdoor air. A fresh filter is the cheapest fix on the list.
We've shipped millions of cabin filters from our American factories since 2013, and the most common comment we hear after a swap is some version of "wow, I didn't realize how bad it had gotten." A dirty cabin filter sneaks up on you. Watch for these:
Weak airflow from the vents. Even on the highest fan setting, it just feels lazy.
A musty or stale smell when the AC kicks on. That's trapped moisture and mildew sitting on the filter media.
Foggy windows that take forever to clear. Your defroster needs strong airflow to work, and a clogged filter starves it.
Allergies acting up in the car. If pollen season feels worse on your commute than in your house, your filter is overdue.
Whistling or howling from the vents. The blower is fighting through a clogged surface, which wears the motor out over time.
Mazda's general guidance is every 15,000 to 30,000 miles, or about once a year, whichever comes first. Lean toward the shorter end if you live somewhere dusty, deal with seasonal wildfire smoke, sit in heavy traffic, or have allergies. If you can't remember when it was last changed, it's time.
Want one less thing to remember? Set up Filterbuy auto-delivery and a fresh filter arrives on whatever schedule you choose. Your only job is the ten-minute swap.
This is the easiest 10-minute job on the entire car. You won't need tools beyond your hands, and basic mechanic experience isn't required. Empty the glove box and you're most of the way there.
Tools you'll need: Nothing. Really.
Park on a flat surface and turn the engine off. No need to disconnect the battery.
Empty the glove box entirely. Including the owner's manual, any loose receipts, and whatever else has accumulated in there.
Release the glove box arms. Squeeze the two side stops inward so the glove box can swing all the way down. On 2019 to 2026 Mazda 3 models, there's also a small damper arm on the right side. Pop that off first.
Locate the filter housing. You'll see a rectangular plastic cover directly behind where the glove box was. Squeeze the tabs and slide it out.
Pull the old filter out. Note which direction it's facing first. There's an airflow arrow on the frame. Don't be surprised if it looks rough. Leaves, pollen, and the occasional bug are par for the course.
Slide the new Filterbuy filter in. The airflow arrow should point DOWN, toward the blower motor. Install it backward and you'll cut airflow and stress the AC. So this is the one step worth slowing down for.
Reverse the steps to button everything back up. Cover, glove box arms, glove box contents. You're done.
In our experience, the moment you pull the old one out and see what it caught is usually when people start thinking about auto-delivery.
There are plenty of places to buy a cabin filter. A few things keep Mazda 3 owners coming back to us.
The media inside our auto cabin filters is HEPA-certified synthetic, with hydrocharged fibers that hold a permanent electrostatic charge. That charge grabs particles as small as 0.3 microns, so 99.97% of pollen, smoke, mold spores, pet dander, and bacteria stays out of your cabin. Airflow stays strong because the charge does the work, not a denser filter.
Every one of these filters is built in our own American factories, in Alabama, Florida, Pennsylvania, and Utah. We've been doing this since 2013, and we don't outsource the quality.
We build to OEM tolerances, which matters more than it sounds. A loose-fitting filter lets unfiltered air sneak around the edges, and that bypass air ruins the whole point. A correct fit is the cheapest insurance policy on this list.
Factory-direct pricing means there's no dealer markup and no middleman in the chain. You pay the manufacturer price, and shipping is free across the continental U.S.
When something does go sideways, the team picking up the phone is in the U.S. Over 75,000 five-star reviews say we don't drop the ball on the follow-up.
| Filterbuy | Dealership | Big-Box Aftermarket |
|
|---|---|---|---|
| Filter media | HEPA-certified, hydrocharged |
OEM paper | Varies |
| Where it's made | USA (AL, FL, PA, UT) |
Imported | Mostly imported |
| Fitment | Built to OEM tolerances |
Exact OEM | Hit-or-miss |
| Cost (filter only) | $20–$38 | $35–$60 | $15–$35 |
| Labor | DIY (10 min) | +$40–$80 | DIY (10 min) |
| Shipping | Free, factory-direct | In-person | Varies |
| Auto-delivery | Yes — set it and forget it |
No | Sometimes |
Authoritative references behind the guidance on this page. These are the same sources Filterbuy turns to when answering questions about indoor air quality, cabin filter performance, and Mazda OE specifications.
1. U.S. Environmental Protection Agency — Indoor Air Quality
https://www.epa.gov/report-environment/indoor-air-quality
The EPA's primary reference on indoor air pollution. It's where the well-known figures come from — like the fact that indoor air can be 2 to 5 times more polluted than outdoor air, and that the average American spends roughly 90% of their time indoors.
2. U.S. EPA — What Is a HEPA Filter?
https://www.epa.gov/indoor-air-quality-iaq/what-hepa-filter
The federal definition of HEPA filtration, including the 99.97% capture standard at 0.3 microns. A go-to source any time you want to know what a true HEPA filter actually does (and what it doesn't).
3. U.S. EPA — The Inside Story: A Guide to Indoor Air Quality
https://www.epa.gov/indoor-air-quality-iaq/inside-story-guide-indoor-air-quality
A deeper EPA guide covering the everyday sources of indoor air pollution and the health effects most people never stop to think about — allergens, mold spores, smoke, and VOCs from common household products.
4. American Lung Association — Clean Air Indoors
https://www.lung.org/clean-air/indoor-air
The American Lung Association's plain-language guide to indoor air pollution and practical steps you can take to breathe easier — at home and in your car.
5. MazdaShop USA — Mazda 3 Cabin Air Filter (Genuine OEM)
The official Mazda OEM parts retailer's full listing of Mazda 3 cabin filter part numbers from 2004 through 2026 — useful any time you need to confirm the correct OE part for a specific model year.
6. Filterbuy — How to Replace a Cabin Air Filter at Home, Step by Step
Our complete DIY walkthrough for replacing a cabin air filter at home, with the tips and small details that make the job go smoothly across most makes and models.
Each statistic below is sourced from a primary authority and ready to use on the page. The numbers hold up to fact-checking and reinforce why a good cabin air filter is worth thinking about.
Statistic 1: Indoor air can be 2 to 5 times more polluted than the air outside.
Americans spend about 90% of their time indoors — and according to the EPA, indoor concentrations of some pollutants are often two to five times higher than the air outdoors. That includes the cabin of your car, where dust, pollen, and exhaust can build up fast without a working filter.
Source: U.S. Environmental Protection Agency — https://www.epa.gov/report-environment/indoor-air-quality
Statistic 2: A true HEPA filter captures 99.97% of particles as small as 0.3 microns.
By the EPA's own definition, a HEPA filter removes at least 99.97% of dust, pollen, mold, bacteria, and other airborne particles down to 0.3 microns — the size that's hardest to catch. Larger and smaller particles are actually trapped with even higher efficiency.
Source: U.S. Environmental Protection Agency — https://www.epa.gov/indoor-air-quality-iaq/what-hepa-filter
Statistic 3: Cabin air filtration cuts in-vehicle pollutants by roughly 30% during real-world drives.
A 2023 peer-reviewed study published in Environmental Science & Technology measured what cabin filters actually do for the air drivers breathe. During real-world commutes, running a cabin air filter reduced ultrafine particles by 28%, PM2.5 by 30%, and black carbon by 32%.
Source: National Library of Medicine —
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9979657/
After more than a decade of shipping cabin filters to Mazda owners, here's what we keep coming back to:
This is the most-skipped maintenance item on the car. It also has the biggest day-one payoff.
What customers tell us they notice within a drive or two of a swap:
• The AC blows stronger almost immediately
• The defroster wakes back up on cold mornings
• Allergy symptoms in the car start settling down
• The musty smell goes away
All of that for roughly $25 and ten minutes in your driveway.
Mazda's published interval of 15,000 to 30,000 miles is too generous for most American drivers in 2026. Three reasons we say that:
1. Wildfire smoke now reaches well past the West Coast every summer.
2. Pollen seasons are getting longer and more intense.
3. In-vehicle PM2.5 stays elevated even on routine commutes. A peer-reviewed 2023 study in Environmental Science & Technology found that running a cabin air filter cuts in-cabin PM2.5 exposure by about 30%, and that's the result with a properly maintained filter, not a saturated one.
Change yours every 12,000 miles or once a year, whichever lands first.
Cost difference between a 12,000-mile rhythm and Mazda's 30,000-mile rhythm:
about
$15 a year.
Air-quality difference: much bigger.
Don't wait for a symptom.
The cabin filter doesn't fail loudly. It quietly stops working, and most people adapt to the slow drop in performance without noticing the slide. The first time you pull the old one out and actually see what it caught is usually the moment auto-delivery starts to make sense.
Filters are small. Their job isn't. We've spent thirteen years building ours to outperform what came out of the box, and we ship every one factory-direct from our U.S. plants.
Clean air, without the hassle. That's the bar we set in 2013, and it's still the bar.
Three to do now. One bonus if you want it.
Match your year to a part number.
Scroll to the lookup table. Grab the OE code for your year.
Screenshot it for next year's swap.
Order the filter.
Tap "Find My Mazda 3 Cabin Filter." We'll route you to the right product page.
Shipping is free across the continental U.S.
Block ten minutes on a Saturday.
Pull down the glove box.
Follow the 7-step how-to above.
Don't want a calendar reminder next year? Turn on auto-delivery. We'll ship the next one when it's due.
Mazda has used five different OE cabin filter part numbers across Mazda 3 model years: BP8P-61-J6X (2004–05), BP4K-61-J6X (2006–09), BBM4-61-J6X (2010–13), KD45-61-J6X-9U (2014–18), and BDGF-61-J6X (2019–26). Match your year in the lookup table above.
Replacement filters typically run $18 to $38 depending on the year, brand, and whether the filter includes activated carbon for odor control. Dealership labor can add another $40 to $80. With Filterbuy, you skip both the markup and the dealer trip.
On every Mazda 3 from 2004 to 2026, the cabin filter sits behind the glove box. Empty the glove box, squeeze the side stops so it drops down, and you'll see the filter housing. No tools required.
Mazda's general guidance is every 15,000 to 30,000 miles, or about once a year, whichever comes first. Lean toward the shorter end if you drive in dusty areas, deal with seasonal wildfire smoke, or live somewhere with high pollen counts. Allergy sufferers often notice the difference on the first drive after a swap.
Standard pleated filters, ours included, are built to be replaced rather than washed. Cleaning damages the media's electrostatic charge, so even if the filter looks fine after a rinse, it won't catch fine particles the way it did new. Use a fresh one.
HEPA media traps particles down to 0.3 microns: dust, pollen, smoke, pet dander, mold spores. Activated carbon traps gases and odors instead, like exhaust fumes and that musty AC smell. The best cabin filters combine both. Filterbuy auto cabin filters use HEPA-certified synthetic media, and carbon options are available for many Mazda 3 model years
Yes. Mazdaspeed3 (2007–2013) shares cabin filter part numbers with the same-year Mazda 3. Use BP4K-61-J6X for 2007–09 Speed3s and BBM4-61-J6X for 2010–13.
Airflow drops, your AC works harder, and your blower motor takes a beating that can shorten its life. Worse, trapped allergens, mold spores, and exhaust fumes get recirculated through the cabin you and your passengers breathe. The EPA reports that indoor air can be 2 to 5 times more polluted than outdoor air, and a saturated filter can make it worse. A 10-minute, roughly $20 swap fixes it.
Almost always, if the old one was overdue. A clogged filter chokes airflow at the inlet, and the blower can't fully compensate. Customers tell us their AC feels noticeably stronger on the first drive after a fresh filter.
Yes. We ship free across the continental U.S. straight from our American factories. Orders typically go out within a day, with no middlemen and no parts-counter holds.
Once you start paying attention to the air in your car, you start noticing the air everywhere else: the bedroom, the living room, the office. We get it. That's why we built Filterbuy in the first place.
If you're thinking about the bigger picture, we make 600+ standard HVAC filter sizes, plus custom filters, complete heating-and-cooling solutions for the rest of the house and now… perfect cabin air filter replacements for various car models.
Clean air, without the hassle. That's the Filterbuy promise, in your driveway and in your living room.
