12 14 600 Removing/replacing knock sensors (N54)

IMPORTANT: Aluminium screws/bolts must be replaced each time they are released.
Aluminium screws/bolts are permitted with and without color coding (blue).
For 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.
Remove INTAKE AIR MANIFOLD .

Unlock plug (1) and remove.

Feed out plug (1) behind feed line, remove FEED LINE if necessary.

Fig 1: Identifying Connector

Courtesy of BMW OF NORTH AMERICA, INC.

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

Installation:

Replace aluminium screws.
Tightening torque 13 62 5AZ .

Fig 2: Locating Knock Sensors Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Clean contact surface of knock sensors on engine block.

Fig 3: Locating Contact Surface Of Knock Sensors On Engine Block

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Add final details to vehicle.

Check stored fault message.

Now clear the fault memory.