How to replace an Audi A4 air filter?

I need to replace the air filter on my Audi A4 sedan. What is the correct procedure and tools needed for this task?

First, locate the air filter housing which is usually near the engine. Remove the screws or clips holding the housing cover in place and carefully take out the old filter. Make sure to check the condition of the filter and clean the housing before installing the new one. As for tools, you may need a screwdriver, pliers, and an air filter wrench.