How to change air filter in Mazda CX-5 2021?

Yes—both the engine air filter and the cabin air filter on a 2021 Mazda CX-5 can be replaced by the owner.

In this guide, you’ll find practical, step-by-step instructions for locating and swapping each filter, plus the tools you’ll need, safety notes, and maintenance tips to keep your SUV running cleanly and efficiently.

Engine air filter replacement

Tools and preparation for replacing the engine air filter

• New engine air filter compatible with the 2.5L engine


• Flathead screwdriver or Phillips screwdriver (if your model uses screws instead of clips)


• Clean rag for wiping the housing


• Pair of gloves to keep your hands clean

Follow these steps to locate and replace the engine air filter in your CX-5

1. Park on level ground, turn off the engine, and apply the parking brake. Open the hood and secure it.


2. In the engine bay, locate the rectangular air filter housing. It’s a black plastic box connected to the intake hose near the front of the engine.


3. Release the clips or remove the screws holding the lid. Lift the cover to expose the old filter.


4. Take out the old filter and inspect the orientation. Most filters have a directional arrow; note which way it points.


5. Clean the inside of the housing with a rag, removing any dust or debris. Be careful not to push debris into the intake.


6. Insert the new filter, matching its orientation to the old one and the housing’s airflow direction (arrow toward the engine). Ensure the filter sits flat and fully seated.


7. Reinstall the housing lid and secure the clips or screws firmly to seal the box.


8. Start the engine and listen for any unusual sounds. If everything runs smoothly, close the hood.

After completing the engine filter replacement, verify that the intake hose is properly attached and that nothing is loose in the engine bay.

Cabin air filter replacement

Overview and prerequisites for cabin filter replacement

• In most CX-5 models, you won’t need special tools to replace the cabin filter, though a small screwdriver may help with any stubborn clips


• New cabin air filter compatible with the CX-5 interior HVAC system


• Optional flashlight for better visibility behind the glove box

Step-by-step to replace the cabin filter behind the glove box

1. Park on level ground, turn off the engine, and engage the parking brake for safety.


2. Open the glove box. On many trims you’ll need to gently press in the sides or remove dampers to lower the box fully.


3. Look for the cabin air filter access door behind the glove box and remove its cover to reveal the old filter.


4. Remove the old filter, noting the correct orientation and how the filter sits in the housing.


5. Wipe the filter housing area if needed to remove dust, then install the new filter with the airflow arrows pointing toward the HVAC unit (into the car).


6. Reattach the access door, raise the glove box back into place, and ensure the dampers click back in securely.


7. Run the HVAC system on a low setting to confirm smooth airflow and to ensure there are no unusual odors.

Regular cabin filter replacement intervals are typically every 12,000–15,000 miles or at least once per year, depending on driving environment (dusty roads, heavy pollution, or allergies may require more frequent changes). Check the owner's manual for factory-recommended intervals.

These steps are generally applicable to the 2021 CX-5, but variations can occur by trim level or regional market. If in doubt, consult the owner's manual or contact a Mazda service advisor for model-specific guidance.

Summary

Changing the air filters on a 2021 Mazda CX-5 is a straightforward maintenance task that protects engine performance and improves interior air quality. For the engine air filter, access the engine bay, remove the old filter, install a new one with the correct orientation, and reseal the housing. For the cabin air filter, access is behind the glove box; replace the filter with arrows aligned to the HVAC system, and reassemble the glove box. Use the recommended replacement intervals and adapters, and verify fit and seal after installation to prevent unfiltered air from bypassing the filters.