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

WARNING: This page is about a different car, the 2002 BMW Z3 and 2001 BMW Z3. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

For Special Tool identification, see SPECIAL TOOLS - Z3 .

Special Tools Required:

11 7 020
11 7 030

Check function of Digital Engine Electronics (DME). Refer to CHECKING - SETTING ENGINE .

Read out fault memory, clear if necessary.

Illustrations show M54.

Remove cover from fuel injectors.

Fig 1: Removing Cover From Fuel Injectors

Courtesy of BMW OF NORTH AMERICA, INC.

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.

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.

Fig 2: Releasing Oxygen Monitor Sensor From Cylinders

Courtesy of BMW OF NORTH AMERICA, INC.

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

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 3: Securing Oxygen Monitor Sensor With 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 EMISSIONS CONTROL OXYGEN .

Cover oxygen monitor sensors when applying underseal.

Pay attention to cable routing of oxygen monitor sensors.