11 78 513 Replacing both oxygen control sensor (M54)

WARNING: This page is about a different car, the 2005 BMW Z4, 2004 BMW Z4, and 2003 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

11 7 020

Necessary preliminary tasks:

Read out fault memory of control unit of Digital Motor Electronics (DME).

Switch off ignition.

WARNING: Scalding hazard!
Only perform this task on an engine that has cooled down.

Unclip plug connection (1) and disconnect.

Release both oxygen sensors (2) with special tool 11 7 020.

Fig 1: Releasing Both Oxygen Sensors With Special Tool 11 7 020

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Threads of new oxygen sensors are already coated with Never Seez compound.

If an oxygen sensor is reused, only apply a thin and uniform coat of Never Seez compound to thread.

Oxygen sensor section projecting into exhaust system branch must not be cleaned or come into contact with lubricant.

Pay attention to cable routing of oxygen sensors.

Use special tool 11 7 020 to tighten down oxygen sensor.

Tightening torque, see 11 78 1AZ in ENGINE - TIGHTENING TORQUES .

Cover oxygen sensors when applying underseal.

Installation:

Check stored fault messages.

Now clear the fault memory.