Oil sensor position - GF18.40-P-4111-01AM

Model 215, 220, 463 

Figure, left: view of engine from the right 

Figure, right: view of engine from below, oil pan dismounted 

Fig 1: Identifying Oil Sensor (Oil Level, Temperature And Quality)

Courtesy of MERCEDES-BENZ USA

The oil sensor is located in front of the front axle at the bottom right or in the oil pan.