Pull the hood release found under the driver's side dashboard.
Press the hood latch at the front of the hood and lift the hood.
Locate the engine air filter on your BMW 3-Series. As shown in this picture, the air filter is the large black box on the driver's side.
To remove the old filter, remove two Torx screws shown in the picture.
Open the air filter housing and pull out the old filter. Inspect the condition of the air filter. Check the filter housing to make sure it is free of dust, particles, or leaves. Use a vacuum to clean the air filter housing of your BMW 3-Series if necessary.
Install new BMW 3-Series air filter and secure the screws. Ensure the housing is closed properly