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

Special tools required:

11 7 020
11 7 030

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

Illustrations show M54.

Remove cover from fuel injectors.

Fig 1: Disconnecting Plug Connections

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.

Fig 2: Releasing Oxygen Monitor Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

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.

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 (refer to BMW Parts Service) 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: Installing Oxygen Monitor Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Cover oxygen monitor sensors when applying underseal.

Pay attention to cable routing of oxygen monitor sensors.