12 14 600 Removing/replacing knock sensors (N55)

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2015 BMW 740i, 2015 BMW 740Li xDrive, 2015 BMW 740Li, 2014 BMW 740i, and 2014 BMW 740Li xDrive. 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 Knock Sensor Connector

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

Tightening torque 13 62 3AZ .

Fig 2: Locating Screws On Knock Sensors

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Installation note:

Clean contact surface of knock sensors on engine block.

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

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