Why does my Audi A2's engine make a rattling sound upon acceleration?

I've noticed that when I start accelerating in my Audi A2, there is a noticeable rattling noise coming from the engine. How do I diagnose and fix this issue?

There are a few potential causes for this rattling sound. One possibility is that your engine oil is low or old. Check your oil levels and schedule an oil change if necessary. Another possible cause could be a loose or worn out belt in the engine. Have a mechanic inspect and replace any worn belts.