The 2021 Toyota Highlander uses two primary air filters: one engine air filter and one cabin air filter.
This article explains what those filters are, where they sit in the vehicle, and why they matter for performance and air quality. It also covers basic guidance on where to find and replace them for common trim levels of the 2021 Highlander.
Air filtration components in the 2021 Highlander
Two filters work together to protect the engine and the air inside the cabin. The list below identifies each filter and its role.
- Engine air filter — located in the engine bay; it prevents dust and debris from entering the intake system and affecting performance and efficiency.
- Cabin air filter — located behind or near the glove box; it cleans air entering the cabin through the HVAC system and may incorporate activated carbon or a PM2.5 filtration layer in higher trims to reduce odors and pollutants.
These two filters cover the essential air-cleaning needs of the Highlander, from power and efficiency to occupant comfort and health.
Where to locate and replace
Replacing the engine air filter is typically done from the engine bay, while the cabin air filter replacement involves accessing the glove box area. Always consult the owner's manual or a dealership for the exact steps and the recommended replacement intervals for your specific trim and driving conditions.
Summary
For the 2021 Highlander, there are two air filters: one engine air filter and one cabin air filter. Regular maintenance according to Toyota's recommendations helps maintain engine performance and cabin air quality.