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Home >> BMW >> 2001 >> M3 2D Convertible >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Electrical System - Repair >> Electronic Switching Or Control Unit >> 12 14 600 Replacing Knock Sensor(s) (S54)

12 14 600 Replacing Knock Sensor(s) (S54)

Interrogate fault memory of DME control unit. Switch off ignition.

Remove intake air manifold. Refer to 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (S54) .

Release nuts and place idle-speed control valve (1) to one side.

Fig 1: Locating Idle-Speed Control Valve
G03118134Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug and detach from knock sensor.

Release knock sensor screw connection on engine block.

Installation:

Tightening torque, refer to 12 14 2AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

Remove knock sensor.

Fig 2: View Of Knock Sensor
G03118135Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

  1. Clean contact surface of knock sensors on engine block.
Fig 3: Identifying Contact Surface Of Knock Sensors On Engine Block
G03118136Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Interrogate fault memory of DME control unit. Check stored fault messages. Rectify faults. Then clear fault memory.
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