Why does my Audi A2 engine make a knocking noise when accelerating?

I have noticed that my Audi A2 makes a knocking noise whenever I accelerate. It seems to be coming from the engine. I'm concerned that it may be a sign of a bigger problem. What could be causing this?

It is likely that the knocking noise is due to a faulty spark plug or ignition coil. This can cause the fuel to ignite prematurely and create the knocking sound. I recommend having a mechanic check and replace these components if necessary.

Another possible cause could be a malfunctioning fuel injector. If the fuel is not being distributed properly, it can create a knocking noise when the engine is under load. I suggest getting the fuel system checked and cleaned by a professional mechanic.

Check the engine oil level and quality. Low oil levels or poor quality oil can cause engine knocking. I recommend changing the oil and filter if needed.