Why is my Audi A2 engine making a strange ticking noise?

I recently noticed that my Audi A2's engine is making a strange ticking noise. It only happens when I'm idling at a stop light, but it's definitely noticeable. Is this something that I should be concerned about? What could be causing it?

It's likely that your engine is experiencing a misfire. This could be caused by a variety of factors such as dirty spark plugs or a clogged fuel injector. It's important to have this issue addressed as soon as possible to avoid any potential damage to your engine.