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

I have noticed a knocking sound coming from the engine of my Audi A4. What could be causing this and how can I fix it?

This knocking sound could be due to a number of reasons, such as low oil levels or worn out engine bearings. It is best to take your Audi to a certified mechanic to diagnose the issue and provide a proper fix.

It is important to regularly check and maintain your engine oil levels to prevent any damage to your engine. Considering the age of your Audi A4, it could also be a sign of worn out engine bearings. Get it checked by a professional mechanic.