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

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 BMW X3, 2016 BMW X3, 2015 BMW X3, 2014 BMW X3, and 2013 BMW X3. 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 DAMAGE (ESD PROTECTION) .

Necessary preliminary work:

Read out the fault memory of the DME control unit.
Switch off ignition.
Disconnect BATTERY EARTH 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 Rear Plug From Control Unit

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 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.