Why does my Audi A2's engine sound weird when accelerating?

I recently noticed that my Audi A2's engine makes a strange noise when I press on the gas pedal. It's almost like a rattling or knocking sound. What could be causing this?

It's possible that there could be an issue with your fuel injectors. You may want to get them checked and potentially replaced to fix the noise issue.

Have you checked your air filter recently? A dirty or clogged air filter can sometimes cause strange noises in the engine.

It could also be a problem with your timing belt or chain. This is a crucial component in your engine and can cause strange noises when it starts to wear out.