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

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW X5, 2006 BMW X3, 2005 BMW X5, 2005 BMW X3, and 2004 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

11 7 030
11 9 150

Necessary preliminary tasks:

Read out DME fault memory.
Remove protection under transmission.
Remove cover from injector valves.

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

Unclip cable and plug.

Fig 1: Disconnecting Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Disconnect plug connection.

IMPORTANT: Mark sensor plug connections (risk of mix-up) .

NOTE: For purposes of clarity, this work step is shown on the removed exhaust manifold.

Release monitor sensor with special tool 11 7 030 in conjunction with special tool 11 9 150.

Fig 2: Releasing Monitor Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Tightening torque 11 78 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Installation:

When special tool 11 9 150 is used in conjunction with special tool 11 7 030, 53 N.m on the dial on the torque wrench corresponds to an actual tightening torque of 50 N.m.

Installation:

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

If a monitor sensor is reused, apply a thin and even coating of Never Seez compound (refer to BMW Parts Service) to the thread only.

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

Cover monitor sensor when applying underseal. Check function of DME.