Why is the Audi A1's engine making a strange noise?

I recently purchased a used Audi A1 and after driving it for a few weeks, I noticed that the engine is making a strange noise. It almost sounds like a rattling or knocking sound. What could be causing this and how can I fix it?

The strange noise could be caused by a number of issues, such as a loose belt or a faulty component in the engine. It's best to get it checked by a certified mechanic to diagnose the problem.

I had a similar issue with my Audi A1 and it turned out to be a loose heat shield. The mechanic was able to tighten it and the noise went away. I would suggest getting it looked at as soon as possible to avoid any potential damage.