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Hi Bob, my name is***** there any warning lights coming on in the instrument cluster when this happens?
Ok, your problem will be with one of the wheel speed sensors or with the traction control module. The speed signal for the speedometer comes from the wheel speed sensors and goes through the traction control module then to the speedometer. This will not be a speedometer problem. You need to get the car connected to a Mercedes diagnostic tester to check for fault codes in the traction control module in order to determine which sensor is needed or if the traction control module is faulty.
Let me know if you need anything else.