The particular car make and model that I will show how to change an air filter using detailed photographs is Ford Mondeo 2005, TDCI, 2 Litre Diesel, MK3. This is demonstration is a part of annual 10,000 miles full service.
Tools required to replace an air filter: A replacement air filter, a multi-bit screwdiver and a vacuum cleaner.
First open the bonet and locate the air filter housing inside the engine bay as shown with the black arrow:
Open the screws surrounding the air filter housing:
Pull open the air filter housing gently, making sure nothing else is in the way:
Comparison of the used and new air filters:
Clean any dirt from the air filter housing with a vacuum cleaner:
Repalce the air filter with a new one and make sure its snug fit:
Closing the air filter housing: