Necessary preliminary tasks

• Remove UNDERBODY PROTECTION .

Installation note: 

The threads of new lambda monitoring sensors are already coated with Never Seez Compound (refer to BMW Parts Department).

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 system branch (sensor ceramics) must not  be cleaned and not  coated with lubricant.

Disconnect plug connection on lambda monitoring sensor (1).

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

Tightening torque 11 78 1AZ .

Installation note: 

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

Fig 1: Identifying Lambda Monitoring Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Disconnect plug connection on lambda monitoring sensor (1).

Release lambda monitoring sensor (1) on exhaust manifold of cylinder nos. 4 to 6 with special tool 11 9 150 .

Tightening torque 11 78 1AZ .

Installation note: 

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

Fig 2: Identifying Lambda Monitoring Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check function of DME.