11 78 530 Replacing left control sensor (N74)

WARNING: Scalding hazard!

Only perform this work after engine has cooled down.

Necessary preliminary tasks:

Check function of DME control unit.
Switch off ignition.
Remove PRESSURE PIPE .

Release plug connector (1) and pull off.

Unclip control sensor cable (2) at retaining clips.

Fig 1: Identifying Plug Connector And Control Sensor Cable

Courtesy of BMW OF NORTH AMERICA, INC.

Release control sensor with special tool 11 7 020.

Fig 2: Releasing Control Sensor Using Special Tool 11 7 020

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

The threads of new lambda control/monitoring sensors are already coated with Never Seez Compound (refer to BMW Parts Department).

If a lambda control/monitoring sensor is to be reused, apply a thin and even coating of Never Seez Compound to the thread only.

The part of the lambda control/monitoring sensor which projects into the exhaust branch (sensor ceramics) must not be cleaned and not coated with lubricant.

Secure control sensor with special tool 11 7 020 and a torque wrench (1).

Tightening torque: see 1AZ in 11 78 EMISSIONS CONTROL, CONTROL SENSOR / MONITORING SENSOR

Fig 3: Securing Control Sensor Using Special Tool 11 7 020

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Check function of DME control unit.

Pay attention to cable routing of control sensor.