11 78 545 Replacing both oxygen monitoring sensors (N54, N54T)

WARNING: This page is about a different car, the 2013 BMW Z4, 2012 BMW Z4, 2011 BMW Z4, 2010 BMW Z4, and 2009 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Risk of burning!

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

Necessary preliminary tasks:

Remove rear UNDERBODY PROTECTION

Installation note:

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

The part of the oxygen monitoring 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 monitoring sensor.

Release monitoring 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 reduce the prescribed tightening torque by 3 Nm.

Tightening torque 11 78 1AZ .

Installation note:

Cable color black, cylinders 1 to 3.

Fig 1: Removing 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 monitoring sensor.

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

Tightening torque 11 78 1AZ .

Installation note:

Cable color grey, cylinders 4 to 6.

Fig 2: Removing Insulation

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check function of DME control unit.