Necessary preliminary work

• Read out the fault memory of the DME control unit.
• Switch off ignition.
• Disconnect BATTERY EARTH LEAD .
• Remove RIGHT INTAKE PLENUM .

Picture shows left side. Procedure on right side identical.

Unlock and disconnect plugs (1) on both knock sensors.

Release screws on both knock sensors (2).

Tightening torque 13 62 5AZ .

Remove knock sensors (3).

Fig 1: Identifying Knock Sensors, Connector And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

Clean support face of knock sensors on engine block.

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

Courtesy of BMW OF NORTH AMERICA, INC.