Owners of other Mazda vehicles such as the CX-5, CX-3, CX-30, MX-30, CX-8, Mazda8 (MPV), MX-5 Miata, Mazda2 (Demio), Mazda3 (Axela), Mazda6 (Atenza) and Mazda5 (Premacy) may also find these DIY instructions to be helpful.

A few compatible replacement cabin air filter elements with their part numbers are as follows: EPAuto CP157, EcoGard XC10622, K&N VF2054, Fram CF12157 and TYC 800213P.

No tools are required to access and replace the filter.

A wet/dry shop vacuum with a crevice attachment may be useful for cleaning the old filter and removing any large debris from the filter slot.

The first few steps are to sit in the front passenger seat, open the glove box and empty out the contents.

Move to the outer right side wall and locate the black plastic glove box damper arm.

Try to avoid using excessive force. The damper arm should pop off relatively easily.

Firmly push in the two side walls of the glove box until the plastic side stoppers can be removed from behind the dashboard.

The plastic hinges at the bottom edge of the glove box might become detached. They can easily be re-attached later on.

Locate the two tabs on the right side of the rectangular shaped white plastic filter access cover.

Gently squeeze together the two tabs on the right side of the filter cover to release the retaining clip.

You'll notice that there is the word "UP" with an arrow printed on the filter cover.

Set the filter cover aside in a safe place.

Slide the filter tray straight out of the slot in the HVAC blower motor housing.

Pull the old filter out of the tray and inspect both sides.

If the old filter is dark grey or black and clogged with dirt, dust, sand, hair, insects, twigs, seeds, soot, pollen and other debris, it should be replaced with a new element.

If the old filter is relatively clean, just tap out the large debris and remove any fine dust with a vacuum.

If your filter has an "UP" arrow, orientate the arrow with it pointing up towards the windshield.

If the new filter has an "Air Flow" arrow, it should be pointing down towards the blower motor fan.

The OEM (original equipment manufacturer) Mazda filter has an "UP" arrow. It was marked with the part number "LBWA4".

Check the filter slot for any large debris such as twigs, leaves or insects. Clean out any debris with the crevice attachment of your shop vacuum.

Lower the new filter into the plastic tray with the arrow in the correct orientation.

Slide the filter tray back into the slot in the HVAC blower motor housing.

Insert the tabs on the left side of the filter cover into their slots.

Push on the right side to secure the retaining clip.

You should feel or hear the retaining clip "click" securely into place.

Double check that the filter cover is securely attached and flush with the blower motor housing at every edge.

Raise the glove box towards the dashboard.

Push the plastic hinges back over their mounting bars on the bottom of the dashboard.

Move to the right side wall of the glove box and push the damper arm on to its mounting peg.

The damper arm should "pop" securely over the mount.

Firmly push in the two side walls of the glove box and re-insert the plastic side stops behind the dashboard.

Replace the contents of the glove box and close it to complete the job.

Enjoy the fresh clean air from your A/C system!

According to the maintenance schedule in the owner's manual for the 2019 Mazda CX-9, the service interval for changing the cabin air filter is every 15,000 miles (24,000 km) or at least every 24 months (two years). (Please check your owner's manual to see the cabin air filter service interval for your CX-9. It may vary depending on the model year or your region of the world.)

For more, please check out all of the 2016-2021 Mazda CX-9 DIY Repair & Maintenance Guides.