What is causing the unusual engine noises in my Audi A1?

I have noticed strange sounds coming from the engine of my Audi A1 when accelerating and idling. It seems to be getting worse over time. What could be causing this and how can I fix it?

The most common cause of unusual engine noises in an Audi A1 is a failing exhaust system. Have a mechanic inspect the exhaust for loose components or cracks, and consider replacing it with a high-quality aftermarket part.