12 14 600 Removing/replacing knock sensors (N52, N52K, N51)

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2010 BMW 528xi, 2010 BMW 528i, 2009 BMW 528xi, 2009 BMW 528i, and 2008 BMW 528xi. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminum screws/bolts exclusively.
Aluminum screws/bolts must be replaced each time they are released.
The end faces of aluminum screws/bolts are painted blue for the purposes of reliable identification.
Jointing torque and angle of rotation must be observed without fail (risk of damage).

Necessary preliminary tasks:

Read out fault memory of DME control unit
Switch off ignition
Disconnect battery negative lead
Remove AIR INTAKE MANIFOLD

Unlock plug (1) and remove.

Fig 1: Identifying Plug

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Release screws on both knock sensors (1) and remove knock sensors (1).

Installation:

Replace aluminum screws.

Tightening torque 12 14 1AZ .

Fig 2: Identifying Knock Sensors

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Installation:

Clean support face of knock sensors on engine block.

Fig 3: Removing Knock Sensors

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NOTE: Check stored fault messages.
Now clear the fault memory.