Why does my Audi A4 make a loud rattling noise when driving at high speeds?

I just bought a used Audi A4 and noticed that it makes a loud rattling noise when I'm driving at high speeds. Is this normal or should I be concerned?

This could be caused by a loose exhaust heat shield. The rattling noise is usually more pronounced at higher speeds. You can try tightening the bolts or taking it to a mechanic for inspection.

It is not normal for an Audi A4 to make a loud rattling noise at high speeds. It could be a sign of engine or transmission issues. I recommend taking it to a certified Audi technician for diagnosis.