11 78 510 Replacing oxygen control sensors (N20, N26)
Special tools required:
- 11 7 030
- 11 4 260
WARNING:
Risk of burning!
Work should only be carried out on an exhaust system that has cooled down.
Work should only be carried out on an exhaust system that has cooled down.
Installation note:
The threads of new oxygen control sensors are already coated with NEVER SEEZ COMPOUND 4.3 .
If an oxygen control sensor is to be reused, apply a thin and even coating of NEVER-SEEZ compound to the thread only.
Sensor ceramics not cleaned and not coated with lubricant.
Necessary preliminary tasks:
- Remove acoustic cover . See 11 12 090 REMOVING AND INSTALLING/RENEWING ACOUSTIC COVER (N20) or 11 12 090 REMOVING AND INSTALLING/RENEWING ACOUSTIC COVER (N26)
Disconnect plug connection on oxygen control sensor (1).
Installation note:
Cable color of oxygen control sensor = black.
Cable color of oxygen monitoring sensor = grey.
IMPORTANT:
When using special tool 11 4 260
, it is essential to reduce the prescribed tightening torque by 3 Nm.
Release oxygen control sensor (2) with special tool 11 4 260 .
Tightening torque 11 78 1AZ .
Reassemble the vehicle.
Check function of DME.