My 2000 Passat also had clicking issues on the front end, especially when making tight turns. I took it to a repair shop, and they said that it’s the front axles (one on each side of the car), and they needed replacing. Part of the issue is how the ball joints are packed. Before I owned the car, my dad had replaced those axles at least twice, and they would begin clicking again after a few years. I finally had one of the axles break a few months ago, and I was told that the part itself would cost around $600, and labor would be a few hundred on top of that.