Why is my Audi's engine making a knocking noise?

I recently purchased a used Audi and have noticed a knocking noise coming from the engine. What could be causing this and how can I fix it?

This could be caused by a number of issues such as worn out spark plugs, low oil levels, or a damaged engine mount. It's best to take your car to a mechanic to diagnose the issue and get it fixed as soon as possible.

Make sure to regularly check your oil levels and change your spark plugs if needed. If the issue persists, it's best to take it to a mechanic for further inspection.