i had that same thing a few years back..
I was driving a GOLF v6 4motion (1 of the worst cars i have ever had) and was driving back from the garage and suddenly the steeringwheel started shaking ,..pulled over and checked the wheels
The left front wheel i could rock a bit so i took the hubcap of (was some special 18" wheel) and 2 of the bolt were loose behind the cap and fell on the ground.
Called the garage and they just said: okay,..you'll better fix it then,..
i did that and drove back to the garage,..let me put it this way: i told them my thoughts :twisted: