How to Replace the Cabin Air Filter on Audi A3

1. Remove the cowling cover from rear of the engine compartment that covers the firewall. The cowling is secured with screws to the frame of the vehicle. Use a screwdriver to remove the screws and set the cowling off to the side.
2. Locate the cabin air filter compartment on the left side of the firewall, next to the heater fan. The air filter is 6-by-9 inches in size and 2 inches thick. It should be mounted vertically against the firewall. Remove the cover by using a screwdriver to lightly unfasten the lid.
3. Remove the cabin air filter from the compartment. Clean out the compartment by vacuuming out any dust. Wipe it down with a clean damp cloth.
4. Replace the old cabin air filter with the new filter and make sure filter is seated properly. Secure the lid on the filter compartment, making sure the pins snap into place.
5. Reattach the cowling cover over the firewall with screws. Remove all tools from the engine compartment.