Why is my Audi A4's engine making a loud knocking noise?

I've noticed that my Audi A4's engine has started to make a loud knocking noise while running. It's only been happening recently and I'm not sure what could be causing it. Can you provide any insight or advice on how to fix this issue?

Hi Sophia, thanks for reaching out. The loud knocking noise could be due to a variety of reasons, such as low oil levels, worn out engine components, or even a faulty fuel injector. I recommend taking your Audi A4 to a trusted mechanic for a thorough inspection and diagnostic test to determine the root cause of the issue. Once the issue has been identified, they will be able to advise you on the necessary repairs to fix the knocking noise. Hope this helps!