12 14 602 Removing/replacing knock sensor (1st and 2nd cylinder) (N20, N26)

Necessary preliminary tasks: 

• Read out the fault memory of the DME control unit.
• Switch off ignition.
• Remove THROTTLE VALVE ASSEMBLY .

Unlock connector (1) and remove.

Release bolt (2) on knock sensor.

Tightening torque 13 62 4AZ .

Remove knock sensor for 1st and 2nd cylinder.

Fig 1: Identifying Knock Sensor Bolt And Connector

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

Clean contact surface of knock sensors on engine block.

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

Courtesy of BMW OF NORTH AMERICA, INC.