Why does my Audi A1's engine make a rattling noise at high speeds?

I recently noticed that my Audi A1's engine makes a loud rattling noise whenever I accelerate to high speeds. It only happens on the highway. Any idea what could be causing this issue?

It could be due to a malfunctioning spark plug. This can cause the engine to misfire at high speeds, creating a rattling noise. I would recommend getting your spark plugs checked and replaced if necessary.

Another possible cause could be low engine oil levels. When the oil levels are low, the engine has to work harder and can make strange noises. Check your oil level and top up if needed.

It could also be a problem with the exhaust system. A loose or damaged exhaust could create a rattling noise. I suggest taking your car to a mechanic to get it inspected and repaired.