12 51 210 Replacing wiring harness section for ignition and injectors (N20, N26)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2016 BMW 328i xDrive, 2016 BMW 328d xDrive, 2015 BMW 328i xDrive, 2015 BMW 328d xDrive, and 2014 BMW 328i xDrive. 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 work:

Read out the fault memory of the DME control unit.
Switch off ignition.
Remove ACOUSTIC COVER
N20 only:
Remove PRESSURE CONVERTER FOR EXHAUST TURBOCHARGER .

Fig 1: Overview Of Ignition And Injectors Wiring Harness Section

G10102349

Courtesy of BMW OF NORTH AMERICA, INC.

Overview of wiring harness section for ignition and injectors.

Unlock and remove connector (1) from control unit.

Fig 2: Identifying Control Unit Connector

G09914370

Courtesy of BMW OF NORTH AMERICA, INC.

Release wiring harness from clamps (1).

Fig 3: Identifying Wiring Harness Clamps

G09914371

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: This procedure is applicable to all cylinders.

Unlock and disconnect connector (1) at injectors.

Slacken nut (1) and remove ground cable (3).

Tightening torque 12 52 2AZ .

Fig 4: Identifying Injectors Connector And Ground Cable

G09846796

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: This procedure is applicable to all cylinders.

Release connector catch (1) at ignition coil (2) and pull off connector.

Fig 5: Releasing Ignition Coil Connector Catch

G09914031

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock retaining lug (1) in direction of arrow.

Pull cable channel (2) from cylinder head cover.

Pull out and remove wiring harness section for injectors and ignition coils.

Fig 6: Pulling Cable Channel From Cylinder Head Cover

G09914374

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check stored fault messages.
Clear diagnostic fault entries from fault memory.