12 51 001 Replacing wiring harness section for engine (N14)

Necessary preliminary tasks: 

• Read out fault memory of DME control unit
• Switch off ignition
• Disconnect Battery Negative Lead 
• Remove Intake Air Manifold 
• remove Sound Generator 

Unlock and remove cover (1).

Fig 1: Engine Wiring Harness Cover And Locks

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Unlock the two rear plugs (1) and disconnect.

Fig 2: Engine Wiring Harness Rear Plugs

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Release clamps (2).

Detach pressure pipe (3) and remove.

Remove clean air pipe (4).

Fig 3: Pressure Pipe, Air Pipe And Clamp

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Unlock and detach plugs (1 and 3).

Unlock and detach vacuum line (2).

Carefully detach cable duct (4) upwards slightly from holder.

Fig 4: Cable Duct, Vacuum Line, Plugs And Removal Direction

Courtesy of BMW OF NORTH AMERICA, INC.