So I go to start my car and the key won't move out of the position I put it in. I was there for an hour moving the steering wheel, which is locked, and trying to get the key to move to start the car. I left and came back and tried again, but nothing. The problem started around wednesday, but I managed to move the streering wheel back and fourth and it let the key start the engine.

So I called mercedes roadside assistance and they say that there's nothing they can do, but call a tow truck driver. I am assuming that the key reader or whatever you call it has worn out, which I have never even heard of happening to a car. The mercedes tech said maybe one of the keys in the ignition lock wore down or something to that nature. I know it's not the key, because it works in the door and I even tried the master key.

Does anyone know any thing about this problem, what I can do about it, and what might it cost. The car is a 96 c220 with almost 140000 miles. Any help would be appreciated.