Why is my Audi A3's engine making a strange noise?

I recently noticed that my Audi A3's engine is making a strange noise that it never made before. It's not a loud noise, but it's definitely noticeable. What could be causing this and how can I fix it?

There could be a few reasons why your engine is making a strange noise. One possibility is that there is an issue with the engine's belts or pulleys. Another possibility is that the oil needs to be changed. It's always best to get a professional opinion and have your vehicle checked by a mechanic.