11 78 545 Replacing both oxygen monitoring sensors (N52)

Special tools required: 

• 11 9 150 .

Work should only be carried out on an exhaust system that has cooled down.

Necessary preliminary work: 

• Remove UNDERBODY PROTECTION .

Installation note: 

The threads of new lambda monitoring sensors are already coated with NEVER-SEEZ COMPOUND .

If a lambda monitoring sensor is to be reused, apply a thin and even coating of NEVER-SEEZ compound to the thread only.

The part of the lambda monitoring sensor which projects into the exhaust branch (sensor ceramics) must not  be cleaned and not  coated with lubricant.

Disconnect plug connection for oxygen monitoring sensor.

Release and tighten lambda monitoring sensor (1) on exhaust manifold of cylinder nos. 1 to 3 with special tool (2) 11 9 150 .

Tightening torque 11 78 1AZ .

Installation note: 

When special tool 11 9 150 is used, 47 Nm on torque wrench scale corresponds to an actual tightening torque of 50 Nm

Cable color of lambda monitoring sensor (1), cylinders nos. 1 to 3 = black.

Fig 1: Identifying Lambda Monitoring Sensor And Special Tool (11 9 150)

Courtesy of BMW OF NORTH AMERICA, INC.

Disconnect plug connection for oxygen monitoring sensor.

Release lambda monitoring sensor (1) on exhaust manifold of cylinder nos. 4 to 6.

Tighten with special tool (2) 11 9 150 .

Tightening torque 11 78 1AZ .

Installation note: 

When special tool 11 9 150 is used, 47 Nm on torque wrench scale corresponds to an actual tightening torque of 50 Nm

Cable color of lambda monitoring sensor (1), cylinders nos. 4 to 6 = grey.

Fig 2: Identifying Lambda Monitoring Sensor And Special Tool (11 9 150)

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check function of DME.