Why is my Audi A3 making strange engine noises?

I recently purchased a used Audi A3 and I have noticed that the engine makes strange noises when accelerating. It sounds like a knocking or rattling noise. What could be causing this and should I be concerned?

It is possible that the engine noise is caused by worn out engine components, such as the timing belt or water pump. I would recommend taking your Audi A3 to a certified mechanic for an inspection to determine the root cause of the issue.

Another possibility is that the knocking noise is actually coming from the exhaust system. This could be due to a loose or damaged exhaust pipe, which can be easily fixed by a mechanic. It's always better to address any strange noises coming from your car's engine or exhaust system to prevent potential future problems.