12 14 600 Removing/replacing knock sensor (3rd and 4th cylinder) (N20, N26)

Necessary preliminary tasks: 

• Read out the fault memory of the DME control unit.
• Switch off ignition.
• Remove STARTER MOTOR .

Unlock connector (1) and remove.

Release bolt (2) on knock sensor.

Tightening torque 13 62 4AZ .

Remove knock sensor for 3rd and 4th cylinders.

Fig 1: Identifying Knock Sensor Bolt And Connector

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

Clean contact surface of knock sensor on engine block.

Fig 2: Locating Contact Surface Of Knock Sensors On Engine Block

Courtesy of BMW OF NORTH AMERICA, INC.