I use Mercedes Benz w202 (230) , I am having a serious condition of gear selection, only when the car is at a junction, taking a turn either to the right or left the gear would select until I park, off and on the car then the selection process will become normal again, this problem only occur whenever there's a turn to either left or right side of the road. On the contrary the car do have perfect selection if it moves on a straight road, it can go a whole 300 miles even more than as long as there won't be a turn to the right or left of the road. Please help, what could be the cause of the problem?