OK....My repair facility replaced the yaw rate sensor late last week as a result of the ETS light being on. Mechanic was enroute to get my ML320 inspected when the ETS light came back on. They went back to the shop and hooked it up and got a C1120 code. They replaced the yaw rate sensor again, with the thought that the sensor replaced last week was NFG. Well, they are still getting the C1120 code. All wiring back to the control unit is fine...they ran a continuity check and found no wiring issues. Any ideas why the code keeps coming up?