What is the cause of rattling noise in the Audi 80's steering wheel?

I have recently noticed that there is a rattling noise whenever I turn the steering wheel in my Audi 80. It's a bit concerning and I'm not sure what could be causing it. I've checked for loose screws and bolts but everything seems to be in place. Any idea what could be causing this and how can I fix it?

The most likely cause of the rattling noise in your Audi 80's steering wheel could be a loose or failing ball joint. This is a common issue in older vehicles and can be fixed by replacing the affected joint.