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

WARNING: This page is about a different car, the 2016 BMW Z4, 2015 BMW Z4, and 2014 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

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.

Fig 1: Removing Monitoring Sensor Using Special Tools (11 7 030) And (11 9 150)

Tightening torque 11 78 1AZ .

Installation note:

Cable colour black, cylinders 1 to 3.

Fig 2: Removing Oxygen Monitoring Sensor Insulation

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 colour grey, cylinders 4 to 6.

Assemble engine.

Check function of DME control unit.