12 51 100 Replacing wiring harness section for ignition and injectors (N55)

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IMPORTANT: Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION) .

Necessary preliminary tasks:

Read out the fault memory of the diagnostic development control unit
Switch off ignition
Disconnect BATTERY NEGATIVE LEAD
Remove IGNITION COIL COVER
Remove CLEAN AIR PIPE
Remove rear ignition coil cover

Unlock rear plug (1) from the control unit and disconnect.

Release rear wiring harness from intake plenum.

Fig 1: Identifying Control Unit Rear Plug

Courtesy of BMW OF NORTH AMERICA, INC.

Release nuts (1) and remove earth cable.

Tightening torque 12 90 5AZ .

Unlock all plugs from ignition coils and injectors and detach.

Unclip wiring harness (2), feed out and remove.

Fig 2: Identifying Wiring Harness And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check stored fault messages.
Delete fault memory.