11 78 540 Replacing Left Monitor Sensor (N63)

Special Tools Required:

11 7 020 .

WARNING: Risk of Burning!
Only Perform This Work After Engine Has Cooled Down.

Necessary Preliminary Tasks:

Check Function of DME Control Unit
Switch Off Ignition
Remove AIR FILTER HOUSING .

Release Retaining Clip (1).

Remove Heat Shield Wire Ring (2) Over Oxygen Sensor.

Detach Oxygen Sensor Cable From Retaining Clips (3).

Fig 1: Identifying Retaining Clip and Wire Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Release Monitoring Sensor (1) with Special Tool 11 7 020 .

Fig 2: Releasing Monitoring Sensor Using Special Tool (11 7 020)

Courtesy of BMW OF NORTH AMERICA, INC.

Installation Note:

The Threads of New Lambda Control/Monitoring Sensors Are Already Coated with Never Seez Compound (Refer To BMW Parts Department).

If A Lambda Control/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 Control/Monitoring Sensor Which Projects Into The Exhaust Branch (Sensor Ceramics) Must Not Be Cleaned and Not Coated with Lubricant.

Fasten Monitoring Sensor (1) with Special Tool 11 7 020 .

Tightening torque 11 78 1AZ .

Fig 3: Releasing Monitoring Sensor Using Special Tool (11 7 020)

Courtesy of BMW OF NORTH AMERICA, INC.

Installation Note:

Check Function of DME Control Unit.

Pay Attention To Cable Routing of Monitor Sensor.