How do I troubleshoot my Audi A2's engine noise?

I've noticed that my A2's engine has been making a strange noise lately. It almost sounds like a knocking or ticking. How can I diagnose and resolve this issue?

First, check your oil level and make sure it's at the appropriate level. Low oil can cause engine noise.

It could also be an issue with the engine's spark plugs. Consider checking and possibly replacing them.

If neither of these solutions work, it may be a more serious issue such as a worn-out valve or damaged piston. Take your car to a mechanic for a proper diagnosis.