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

ENGINE 113.990 /991 /993 

ENGINE 113.992 /995 up to Model Year 8 

Fig 1: Identifying Right Knock Sensor 1 And Left Knock Sensor 2
G07871150Courtesy of MERCEDES-BENZ USA
  Knock sensors, location   GF15.12-P-4101-01AM 
  Knock sensors, task The knock sensors detect the vibrations at the crankcase of the respective cylinder bank.  
  Knock sensors, design The knock sensors are all in one a closed system. Inside the sensor are piezo crystals. The screened 2-pin connection lines are directly put onto the knock sensors.  
  Knock sensors, function   GF15.12-P-4101-02AM