1. Open the hood of your car.
2. Locate the air filter housing. It will usually be a rectangular box near the top of the engine.
3. Unclip or unscrew the air filter housing cover.
4. Pull out the old air filter.
5. Insert the new air filter. Make sure to position it correctly according to the arrows on the filter.
6. Replace the air filter housing cover.
7. Close the hood of your car.
You should change your Audi A4 air filter every 12 months or 12,000 miles. It might need more frequent replacement if you live in a dusty area. Check the owner's manual for specific maintenance recommendations for your vehicle.
