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

I recently noticed that my Audi A4's engine is making a loud knocking noise. It only happens when the engine is cold and goes away after a few minutes of driving. What could be causing this and how can I fix it?

It's likely that your engine has a problem with the oil pump or the oil pressure. It's important to get this checked out by a qualified mechanic as soon as possible, as running the engine with low oil pressure can cause serious damage.

This could also be a sign of worn engine bearings. If not taken care of, this could lead to engine failure. I suggest bringing your car to a trusted mechanic for a thorough inspection and potential replacement.