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Remove/install knock sensors - AR15.12-P-2185CD

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ENGINES 651 in MODELS 204, 207, 212, 218, 221 

Shown on engine 651.911 

Fig 1: Knock Sensors Remove/Install Components
G09975064Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
1 Remove cylinder head cover trim    
2.1 Remove exhaust gas recirculation cooler and place to one side with coolant lines attached When removing cylinder 1+2 knock sensor (A16/4). AR14.20-P-7665CD
2.2 Remove exhaust gas recirculation valve When removing cylinder 3+4 knock sensor (A16/1). AR14.20-P-7662CD
3.1 Disconnect electrical connection (1), release and unplug electrical connector (2) When removing cylinder 1+2 knock sensor (A16/4).  
3.1 Disconnect electrical connection (4), release and unplug electrical connector (5) When removing cylinder 3+4 knock sensor (A16/1).  
4.1 Remove bolt (3) and detach cylinders 1+2 knock sensor (A16/4) When removing cylinder 1+2 knock sensor (A16/4).  
TORQUE SPECIFICATION *BA15.10-P-1001-02E 
4.2 Remove bolt (6) and detach cylinders 3+4 knock sensor (A16/1) When removing cylinder 3+4 knock sensor (A16/1).  
TORQUE SPECIFICATION *BA15.10-P-1001-02E 
5 Install in the reverse order    
KNOCK SENSORS

Number Designation Engine 651
BA15.10-P-1001-02E Bolt, knock sensor to cylinder crankcase Nm 20