11 78 543 Replacing right monitor 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 engine underbody protection. See FRONT UNDERBODY PROTECTION and REAR UNDERBODY PROTECTION .

Detach monitoring sensor (1) from catalyst cylinders 1 - 6 with special tool 11 7 030 and 11 9 150.

Remove monitor sensor (1).

Fig 1: Removing Monitoring Sensor From Catalyst Cylinders Using Special Tool 11 7 030 And 11 9 150

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 monitoring sensor (1) with special tool 11 7 030 and 11 9 150.

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

IMPORTANT: When using special tool 11 7 030 in conjunction with 11 9 150, it is essential to reduce the prescribed tightening torque by 3 Nm to 47 Nm.

Fig 2: Securing Monitoring Sensor From Catalyst Cylinders Using Special Tool 11 7 030 And 11 9 150

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Check function of DME control unit.

Pay attention to cable routing of monitor sensor.