Why is my Audi A2's engine making a strange clicking noise?

I recently noticed that my Audi A2's engine is making a clicking noise whenever I accelerate. What could be causing this and how can I fix it?

The clicking noise could be indicating an issue with the fuel injectors. It is important to get this checked by a mechanic as soon as possible to prevent further damage to your engine.

Another possible cause could be a loose or worn out belt. Have a mechanic check the belts and replace if necessary.