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Mazda CX-9 Engine Air Filter Replacement Guide
How to change the Skyactiv-G 2.5L turbocharged I4 engine's air filter element in a 2016 to 2021 Mazda CX-9.

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2019 CX-9 2.5L I4
Engine Air Filter Box
Front Right Latch
This automotive maintenance tutorial was specifically written to assist owners of the second generation 2016, 2017, 2018, 2019, 2020 and 2021 Mazda CX-9 SUV in cleaning or changing the engine air filter element for the Skyactiv-G 2.5 liter turbocharged inline four cylinder engine.

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 air filters for the Skyactiv-G 2.5L turbocharged I4 engine with their part numbers are as follows: EcoGard XA10597, Mazda PY8W133A0 (also known as PY8W-13-3A0) and K&N 33-3024.

No tools are needed to access and replace the filter.

A wet/dry shop vacuum can be useful for cleaning out the bottom of the air box or cleaning the old filter to re-use it.

The first two steps are to open the hood and then move to the right (driver) side of the engine bay.

The rectangular shaped black plastic engine air filter housing is located just behind the driver side headlight assembly and in front of the electrical fuse box and the 12V battery.

There are two metal latches that secure the two halves of the air box together.

One latch is located near the front right corner of the box. The second latch is situated by the front left corner of the box.


Front Left Metal Latch
Flip Down Left Latch
Release Front Right Latch
Gently flip the two metal latches away from the air box cover and allow them to swing down.

The latches should remain attached to the bottom half of the air filter housing.

Two Fasteners Released
Lift Up Air Box Cover
Old Air Filter Exposed
Carefully lift the front edge of the cover off the top of the air box.

You may need to pull the air box cover forward to dislodge the two tabs on the rear edge from their slots.

Pull Out Old Air Filter
Old Air Filter Removed
Inspect Both Sides
Pull the old air filter straight out of the bottom half of the air box.

The OEM (original equipment manufacturer) air filter in this 2019 CX-9 AWD was marked as part number Mazda SH01-133A0 K8800.

Inspect both sides of the old air filter.

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

I recommend buying the EcoGard XA10597 engine air filter since it has excellent reviews on Amazon from other CX-9 owners.

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

Clean With Vacuum
Clean Out Air Box - Sand
Install New Air Filter
If your vacuum has a crevice attachment, clean out any sand, leaves, insects or debris in the bottom half of the air box.

Lower the new filter into the bottom half of the air box.

The pleats should be facing down and the rubber gasket should be facing up towards you.

Line Up Tabs & Slots
Lower Air Box Cover
Flip Up Left Side Latch
Lower the cover over the top of the air box.

Line up the two plastic tabs on the rear edge of the cover with their corresponding slots on the bottom half of the air box.

Slide the tabs into the slots.

Close the front edge of the air box cover.

Secure Right Side Fastener
Air Box Cover Secured
Filter Change Complete!
Flip up the two metal latches towards the cover.

Snap the latches back into place to secure the two halves of the air filter housing together.

Make sure that the two halves of the assembly are flush together at every edge with no part of the filter visible.

Don't forget to write down the filter change in your vehicle's service records.

According to the 2019 Mazda CX-9 owner's manual, the service interval specification for changing the engine air filter is every 22,500 miles (36,000 km) or at least every 36 months (3 years).

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

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