11 78 611 Replacing oxygen monitor sensor (cylinders 1-3)

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.

Remove cover from injector valves.

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

Unclip cable and plug.

Disconnect plug.

Fig 1: Uncliping Cable And Plug

Courtesy of BMW OF NORTH AMERICA, INC.

Release oxygen monitor sensor from above with special tool 11 7 020.

Fig 2: Releasing Oxygen Monitor Sensor From Above With Special Tool 11 7 020

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

The threads of new oxygen monitor sensors are already coated with Never Seez compound.

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

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

Cover oxygen monitor sensor when applying underseal.

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

Installation:

Check stored fault messages.

Now clear the fault memory.