11 78 545 Replacing Both Lambda Oxygen Monitor Sensors (N54)

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

For the following special tools, refer to ENGINE- SPECIAL TOOLS .

11 7 020
11 7 030
11 9 150

WARNING: Scalding hazard!
Work should only be carried out on an exhaust system that has cooled down.

Necessary preliminary tasks:

Remove rear underbody protection . See 51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION .

Installation:

If an oxygen sensor is to be reused, only apply a thin and uniform coat of Never Seez Compound (refer to BMW Parts Service) to thread.

The part of the oxygen monitor sensor which projects into the exhaust system branch (sensor ceramic) must not be cleaned or come into contact with lubricant.

Disconnect plug connection for oxygen monitor sensor.

Release monitor sensor (1) with special tools 11 7 030 and 11 9 150.

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

Tightening torque. See 11 78 1AZ in EMISSION CONTROL OXYGEN SENSOR .

Installation:

Cable color black, cylinders 1 to 3.

Fig 1: Releasing Monitor Sensor Using Special Tools 11 7 030 And 11 9 150

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Release insulation (2) in direction of arrow.

Disconnect plug connection for oxygen monitor sensor.

Release monitor sensor (1) with special tool 11 7 020.

Tightening torque. See 11 78 1AZ in EMISSION CONTROL OXYGEN SENSOR .

Installation:

Cable color grey, cylinders 4 to 6.

Fig 2: Releasing Insulation

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check function of DME control unit.