Take it to the dealer so they dont complain messing with the car actually made the problem. I know, I dont like it either but seems easiest not to fight it when you have the warrenty. Its the Mercedes version of the Neon, cant expect too much.

Good luck

__________________
1986 190E 186K (For Sale)
(Maroon, Tan leather)
1996 C280 Sport 208K
(Brilliant Silver, Black Leather)
2002 CLK430 Sport 45K
(Brilliant Silver, Gray Leather , Birdseye Maple)