12 14 600 Removing/replacing knock sensors (N55)

WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 2017 BMW M6, 2017 BMW 650i xDrive, 2017 BMW 650i, 2017 BMW 640i xDrive, and 2017 BMW 640i. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Read out the fault memory of the DME control unit.
Switch off ignition.
Remove INTAKE PLENUM .
Vehicles with the Bosch high pressure pump only :
Remove HIGH PRESSURE PUMP .

Unlock connector (1) and remove.

Feed out and remove the connector (1) behind the feed line.

Fig 1: Identifying Connector

Courtesy of BMW OF NORTH AMERICA, INC.

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

Tightening torque 13 62 3AZ .

Fig 2: Locating Screws On Knock Sensors

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Clean contact surface of knock sensors on engine block.

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

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Reassemble the vehicle.
Check stored error/fault messages.
Clear diagnostic fault entries from fault memory.