What should I do if my Audi A3's engine starts making unusual noises?

I've noticed that my Audi A3's engine has been making strange noises lately. What could be causing this and how can I fix it?

First, try checking the oil levels and make sure they are at the appropriate levels. Low oil levels can cause an engine to make strange noises. If the oil levels are fine, then it's possible that there is an issue with the engine's bearings or valves. In this case, it's best to take your car to a certified mechanic for a diagnosis and repair.