11 78 545 Replacing both lambda oxygen monitor sensors (N54)

WARNING: This page is about a different car, the 2010 BMW X6, 2009 BMW X6, and 2008 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

11 7 020
11 7 030
11 9 150

See ENGINE - SPECIAL TOOLS (N54, N63) .

WARNING: Scalding hazard!

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

Necessary preliminary tasks:

Remove rear UNDERBODY PROTECTION .

Installation:

If an oxygen sensor is to be reused, only apply a thin and uniform coat of Never Seez Compound 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 11 78 1AZ , see EMISSION CONTROL

Installation:

Cable color black, cylinders 1 to 3.

Fig 1: Identifying Monitor Sensor And Special Tools (11 7 030, 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 11 78 1AZ , see EMISSION CONTROL

Installation:

Cable color grey, cylinders 4 to 6.

Fig 2: Identifying Monitor Sensor And Insulation

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check function of DME control unit.