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Sensors, location/task/function - GF54.65-P-4102T

MODEL 209.3 /4, 211.0 /2 with CODE (220a) Parktronic system (PTS) 

Fig 1: Locating Sensors
G07288142Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Shown on model 211.0 

Sensors, location The front bumper PTS sensor unit (A42) and rear bumper PTS sensor unit (A43) are located in the respective bumper.
Sensors, task The sensors transmit ultrasonic waves and detect echoes from existing obstacles.
Sensors, function The ultrasonic sensors function based on the echo sounding principle and operate as transmitters and receivers.