The engine air filter is located in a rectangular plastic housing in the engine bay on the driver’s side, while the cabin air filter sits behind the glove box. Both filters are serviceable by you with basic tools.
In this guide, we explain the exact locations for both filters on a 2009 Civic, how to access them, and quick steps to replace them to keep airflow strong and the interior air clean.
Engine air filter location
Use the following steps to locate and replace the engine air filter in a 2009 Civic.
- Park the car on a level surface, turn off the engine, and set the parking brake. Open the hood and locate the engine air filter housing on the driver’s side of the engine bay near the front.
- Release the clips or screws that secure the lid of the rectangular air-filter box. Lift the lid to expose the filter inside.
- Remove the old filter, taking note of the orientation (the filter has an arrow or directional marking).
- Clean the inside of the housing with a rag to remove loose dirt or debris; do not use compressed air that could push debris into the engine.
- Insert the new filter with the correct orientation, aligning it with the housing and any directional arrows.
- Reattach the lid and secure the clips or screws. Close the hood and start the engine to confirm proper operation.
Replacing the engine air filter is a quick maintenance item that helps maintain engine efficiency and performance.
Maintenance notes
Keep the orientation marked on the filter facing the same direction as the old filter. If you drive in dusty or harsh conditions, inspect or replace the filter more frequently according to your manual or local conditions.
Cabin air filter location
Follow these steps to access the cabin air filter behind the glove box on a 2009 Civic.
- Open the glove box and remove contents. On many Civics, you’ll need to detach the glove box damper or gently squeeze the sides to lower the box and access the area behind it.
- Behind the glove box, locate the cabin air filter cover. Remove the cover by unclipping or sliding it off.
- Remove the old cabin filter, noting its orientation (arrows should point toward the front of the car).
- Clean any dust from the filter housing area and insert the new filter in the same orientation.
- Reattach the cover and return the glove box to its normal position. Replace items in the glove box.
- Close the hood if you opened it, and test the HVAC system to ensure proper airflow.
Replacing the cabin air filter helps maintain interior air quality and HVAC efficiency, especially in dusty or pollen-heavy environments.
Tips for cabin filter replacement
Plan to replace the cabin filter roughly once a year or every 15,000 miles (24,000 km) in typical conditions, and more often in dusty areas. If you notice reduced airflow or odors, replace sooner.
Summary
For a 2009 Honda Civic, the engine air filter lives in a rectangular housing in the engine bay on the driver’s side, while the cabin air filter sits behind the glove box. Both can be replaced with basic hand tools and minimal mechanical knowledge, and doing so regularly helps maintain engine performance and interior air quality.