Necessary preliminary tasks

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Read out fault memory of DME control unit
Switch off ignition

Unlock plug (1) and remove.

Release screws.

Pull air-mass flow sensor (2) out of upper section of intake filter housing.

Installation:

Check sealing ring for damage, replace if necessary.

Fig 1: Identifying Plug And Air-Mass Flow Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check stored fault messages.
Now clear the fault memory.