Why does my Audi A6's engine produce strange knocking sounds?

I recently noticed that my Audi A6's engine has been making strange knocking noises. It is quite concerning and I am not sure what it could be. Any ideas?

It could be a sign of engine detonation, which could be caused by a variety of factors such as low fuel quality, excessive engine carbon buildup, or incorrect timing of fuel injection. I recommend having a trained mechanic take a look and diagnose the issue.

Check your oil level and quality. Dirty or low oil can also cause knocking sounds in the engine. If it is not due for an oil change yet, double check for any leaks or potential issues that could be affecting your oil's performance.

It's possible that the knocking sounds are coming from a loose or damaged spark plug. This can cause irregular firing in the engine and result in knocking noises. Have your spark plugs checked and replaced if necessary.