11 78 612 Replacing oxygen monitor sensor (cylinders 4-6)

Special tools required: 

• 11 7 020
• 11 7 030
• 11 9 150

Necessary preliminary tasks: 

• Read out fault memory of control unit of Digital Motor Electronics (DME).
• Switch off ignition.
• Remove cover from injector valves.
• Remove reinforcement plate.

Unclip cable and plug.

Disconnect plug.

Fig 1: Disconnecting Plug

Courtesy of BMW OF NORTH AMERICA, INC.

Automatic transmission: 

Release oxygen monitor sensor with special tool 11 7 030 in conjunction with special tool 11 9 150.

Fig 2: Releasing Oxygen Monitor Sensor With Special Tool 11 7 030 In Conjunction With Special Tool 11 9 150

Courtesy of BMW OF NORTH AMERICA, INC.

Manual transmission: 

Release oxygen monitor sensor with special tool 11 7 020.

Installation: 

The threads of new oxygen monitor sensors are already coated with Never Seez compound.

If an oxygen monitor sensor is reused, only apply a thin and uniform coat of Never Seez compound to thread.

Oxygen monitor sensor section projecting into exhaust system branch must not be cleaned or come into contact with lubricant.

Cover oxygen monitor sensor when applying underseal.

Pay attention to cable routing for oxygen monitor sensor.

Automatic transmission: 

Installation: 

When special tool 11 9 150 is used in conjunction with special tool 11 7 030, 53 Nm on the torque wrench dial corresponds to an actual tightening torque of 50 Nm.

To tighten down oxygen monitor sensor, fit torque wrench and special tools 11 7 030 / 11 9 150 as shown in illustration.

Check stored fault messages.

Now clear the fault memory.

Fig 3: Tightening Oxygen Monitor Sensor Using Torque Wrench And Special Tools 11 7 030/11 9 150

Courtesy of BMW OF NORTH AMERICA, INC.

Manual transmission: 

Installation: 

Tighten down oxygen monitor sensor with special tool 11 7 020.

Tightening torque, see 11 78 1AZ in ENGINE - TIGHTENING TORQUES .

Check stored fault messages.

Now clear the fault memory.