Why is my Audi A4 experiencing engine knocking?

I've noticed a persistent knocking noise coming from my Audi A4's engine while driving. What could be the underlying cause and how can I resolve it?

Firstly, check the engine oil level and quality. Low or poor quality oil can lead to knocking noises in the engine. Also, consider getting a professional mechanic to perform an engine tune-up and replace any faulty spark plugs.

Another possible cause of engine knocking in your Audi A4 could be an issue with the fuel system. Make sure the fuel injectors are clean and functioning properly. You may also want to try using a higher octane gasoline to see if that helps reduce the knocking noise.