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Knock sensors, location/task/design/function - GF15.12-P-4101M

ENGINE 275.950 in MODEL 215, 220 

ENGINE 275.951 in MODEL 230 up to Model Year 8 

ENGINE 275.953 in MODEL 216, 221 up to Model Year 8 

ENGINE 275.954 in MODEL 230 up to Model Year 8 

ENGINE 275.980 in MODEL 215, 220 

ENGINE 275.981 in MODEL 230 up to Model Year 8 

ENGINE 275.982 in MODEL 216, 221 up to Model Year 8 

ENGINE 285.950 in MODEL 240 

ENGINE 285.980 in MODEL 240 

Fig 1: Identifying Knock Sensors
G10108507Courtesy of MERCEDES-BENZ USA
  Knock sensors, location   GF15.12-P-4101-01M
  Knock sensors, task The knock sensor detects vibrations at the crankcase.  
  Knock sensors, design The knock sensor is a self-contained system. Inside the sensor are piezo crystals. The screened cable is fitted directly onto the knock sensor.  
  Knock sensors, function   GF15.12-P-4101-02M