Why is my Audi A1 engine making loud knocking noises?

I recently noticed that my Audi A1's engine has been making loud knocking noises while driving. It seems to get worse when the engine is cold. What could be causing this issue?

It is likely that the knocking noise is coming from a worn out engine bearing. It is important to have this issue addressed as soon as possible to avoid causing further damage to your engine.

Another possibility is that the knocking noise is coming from old or low quality fuel. Try filling up with premium gasoline and see if the noise improves.

One thing to check is the oil level in your engine. Low oil can also cause knocking noises and potentially lead to engine damage. Make sure to regularly check and top off your oil as needed.