How do I check if my Audi's air filter needs to be replaced?

I recently purchased a used Audi and I'm not sure when the previous owner last replaced the air filter. Is there an easy way to check if it needs to be replaced?

You can check the condition of your air filter by holding it up to a light source. If you can see a significant amount of dirt and debris, it's time to replace it. Don't wait until it's completely clogged to avoid potential damage to your engine.

Another way to check if the air filter needs to be replaced is by tapping on it gently. If you hear a rattling sound, it means there is excessive dirt build-up and it should be replaced.