Necessary preliminary tasks

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2011 BMW 328xi, 2011 BMW 328i, 2011 BMW 323i, 2010 BMW 328xi, and 2010 BMW 328i. However, it is still accessible from the selected car via links, so may be relevant.

Read out fault memory of DME control unit
Turn off ignition
Follow instructions for disconnecting and connecting battery
Disconnect battery negative lead from battery and lay to one side
Remove MICROFILTER HOUSING
Remove INTAKE AIR MANIFOLD
Remove CYLINDER HEAD COVER
Remove rear UNDERBODY PROTECTION

Unlock fasteners (1) from below and slide upwards approx. 10 mm.

Unlock locks (2) in direction of arrow.

Remove cover (3).

Fig 1: Unlocking Electronic Box Locks

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug on control unit and disconnect.

Unlock tab (1), pull contact carrier (2) in direction of arrow out of housing.

Fig 2: Pulling Contact Carrier Out Of Housing

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock slide (2) in bore holes (1) and pull out of housing.

Unlock tab (3), pull contact carrier (4) in direction of arrow out of housing.

Unlock and disconnect all plug connections of engine wiring harness section in electronics box.

Fig 3: Pulling Contact Carrier Out Of Housing

Courtesy of BMW OF NORTH AMERICA, INC.