12 14 600 Replacing knock sensor (M52TU, M54, M56)

Necessary Preliminary Tasks:

Check stored fault messages.
Switch off ignition.
Remove intake air manifold. Refer to 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (M54) .

Unclip plug connection (1) from holder of cable duct (2) and disconnect.

Fig 1: Disconnecting Plug Connection From Holder Of Cable Duct

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Release screw (1) and remove knock sensor for cylinder bank 1-3.

Fig 2: Removing Knock Sensor For Cylinder Bank 1-3

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Release screw (2) and remove knock sensor for cylinder bank 4-6.

Fig 3: Removing Knock Sensor For Cylinder Bank 4-6

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Installation:

Clean support face of knock sensors on engine block.

Tightening torque, (20 N.m.).

Fig 4: Identifying Face Of Knock Sensors On Engine Block

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Installation:

Read out fault memory of control unit of Digital Motor Electronics (DME).

Now clear the fault memory.