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

WARNING: This page is about a different car, the 2013 BMW X5, 2012 BMW X5, and 2011 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

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

Necessary preliminary tasks:

Read out the fault memory of the DME control unit.
Switch off ignition.
Disconnect BATTERY EARTH LEAD .
Remove rear ignition coil cover. See 12 REMOVING AND INSTALLING/REPLACING IGNITION COIL COVER (N55) .
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 Rear Plug From Control Unit

Courtesy of BMW OF NORTH AMERICA, INC.

Release bolt (1) at rear of cable channel.

Tightening torque: 12 90 1AZ .

Fig 2: Identifying Rear Of Cable Channel Bolt

Courtesy of BMW OF NORTH AMERICA, INC.

Release nuts (1) and remove earth cable.

Tightening torque: 12 90 5AZ .

Unlock all connectors from ignition coils and injectors and detach.

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

Fig 3: Identifying Earth Cable Nuts And Wiring Harness

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check stored fault messages.
Delete fault memory.