11 78 545 Replacing the lambda monitoring sensor (N55 Hybrid)

Special tools required: 

• 11 7 030
• 11 9 150 .

Work should only be carried out on an exhaust system that has cooled down.

Installation note: 

The threads of new lambda monitoring sensors are already coated with NEVER-SEEZ COMPOUND .

If a lambda 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 monitoring sensor which projects into the exhaust system branch (sensor ceramics) must not  be cleaned and not  coated with lubricant.

Necessary preliminary tasks: 

• Remove REAR UNDERBODY PROTECTION .
• Remove CLEAN AIR PIPE .
• Remove IGNITION COIL COVER .

Release positive battery cable (1) from cable channel.

Disengage cable channel cover (2) to the left and lift out.

Fig 1: Identifying Positive Battery Cable And Channel Cover

Courtesy of BMW OF NORTH AMERICA, INC.

Release wiring harness from cable channel.

Release screws (1).

Release lock (2).

Remove cable channel (3).

Remove soundproofing (4).

Fig 2: Identifying Soundproofing, Cable Channel, Screws, And Lock

Courtesy of BMW OF NORTH AMERICA, INC.

Disconnect plug connection on oxygen control sensor (1).

Installation note: 

Cable color of oxygen control sensor = black.

Cable color of oxygen monitoring sensor = grey.

Fig 3: Identifying Plug Connection On Oxygen Control Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Release oxygen control sensor (1) with special tools 11 7 030 and 11 9 150 with a suitable extension (2).

Tightening torque 11 78 1AZ .

Fig 4: Identifying Oxygen Control Sensor, Special Tools, And Extension

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check function of DME.