There are two air filters: the engine air filter located in the engine bay, and the cabin air filter located behind the glove box on the passenger side.
Engine air filter: location and replacement
The engine air filter sits in a rectangular plastic housing toward the front-right side of the engine bay. The intake hose plugs into the box and runs to the throttle body, and the lid is held on with clips or small screws. Replacing it helps maintain engine performance and fuel efficiency.
Follow these steps to replace the engine air filter:
- Park on a level surface and turn off the engine. Open the hood and locate the engine air-filter housing on the passenger side front of the engine bay.
- Release the clips (or remove screws) securing the lid of the air box and lift the lid off.
- Remove the old filter, noting its orientation for correct placement of the new filter. Inspect the inside of the box for debris and wipe it clean if needed.
- Insert the new filter with the airflow arrows pointing toward the engine, ensuring it seats snugly inside the box.
- Reinstall the lid and secure the clips (or screws). Reconnect any hoses or components you may have moved.
- Close the hood and start the engine to confirm everything is properly sealed and running smoothly.
Engine air filter replacement is typically recommended every 30,000 miles (48,000 km) under normal driving, but conditions such as dusty or off-road use may require more frequent changes. Always consult the owner's manual for the exact interval for your trim and region.
Cabin air filter: location and replacement
The cabin air filter is located behind the glove box on the passenger side. Accessing it involves lowering the glove box and removing a cover to reach the filter. Replacing it helps maintain interior air quality and HVAC performance.
Follow these steps to replace the cabin air filter:
- Park on a level surface and turn off the engine. Open the glove box and gently empty its contents.
- At the sides of the glove box, press inward on the damper stops or sides to release the glove box so it drops down.
- Look for a rectangular access panel or cover at the back of the glove box area and remove it to expose the cabin filter housing.
- Open the cabin filter cover and carefully pull out the old filter. Note the filter’s orientation for proper placement of the new one.
- Insert the new cabin filter with the airflow arrows pointing toward the HVAC system. Reattach the filter cover securely.
- Lift the glove box back into place and snap it back to its normal position. Return any contents you removed.
Cabin filter replacement intervals are typically around 15,000–30,000 miles (24,000–48,000 km) or every 1–2 years, depending on climate and driving conditions. Dusty or urban environments may require more frequent changes. Check the owner’s manual for the exact interval for your vehicle.
Summary
For a 2019 Honda Civic, you’ll find two filters: the engine air filter in the engine bay’s rectangular air box on the passenger side, and the cabin air filter behind the glove box on the passenger side. Both are straightforward to replace with basic tools and routine maintenance helps preserve engine performance, fuel efficiency, and interior air quality. Refer to your owner’s manual for model-specific intervals and any variations by trim level.