11 78 613 Replacing both oxygen monitor sensors (M52TU / M54 / M56)

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2006 BMW 325Ci, 2005 BMW 325xi, 2005 BMW 325i, 2005 BMW 325Ci, and 2004 BMW 325xi. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

NOTE: For special tools, refer to ENGINE - SPECIAL TOOLS .

11 7 020
11 7 030

(for work step number 13 00 002)
Read out fault memory, clear if necessary.

Illustrations show M54.

E46 only

Remove microfilter.

Open cable duct on lower section of microfilter housing (2) and feed out cable (s).

Release screws (1) and remove lower section of microfilter housing (2).

Fig 1: Releasing Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Remove cover from fuel injectors.

NOTE: Do not mix up oxygen monitor sensors for cylinders 1 to 3 and 4 to 6 at plug connection to wiring harness.

Mark plug connections.

Unclip the cable from the retainer.

Disconnect plug. Unclip cable on rear side of engine from cable guide.

Fig 2: Disconnecting Plug And Uncliping Cable On Rear Side Of Engine

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: On vehicles with automatic transmission:

In event of unfavorable tolerances, accessibility to the oxygen monitor sensor from cylinders 4 to 6 is only possible after the exhaust system has been removed.

Release oxygen monitor sensor from cylinders 1 to 3 with special tool 11 7 030.

Release oxygen monitor sensor from cylinders 4 to 6 with special tool 11 7 020.

Fig 3: Releasing Oxygen Monitor Sensor

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.

Part of oxygen control sensor which projects into exhaust system branch must not be cleaned or come into contact with lubricant.

Installation:

Secure oxygen monitor sensor for cylinders 1 to 3 with special tool 11 7 030.

Fig 4: Identifying Special Tool 11 7 030

Courtesy of BMW OF NORTH AMERICA, INC.

Secure oxygen monitor sensor for cylinders 4 to 6 with special tool 11 7 020.

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

Cover oxygen monitor sensors when applying underseal.

Pay attention to cable routing of oxygen monitor sensors.