Removing and installing/replacing oxygen monitoring sensor, cylinders 1-3 (S55 engine)
Special tools required:
- 11 7 030
- 11 7 020
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.
If a oxygen control 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 sensor which projects into the exhaust system branch (sensor ceramics) must not be cleaned and not coated with lubricant.
Necessary preliminary work:
- Remove REAR ENGINE GUARD .
- Remove STIFFENING PLATE .
Removal:
Unlock and disconnect yellow plug connection of monitoring oxygen sensor, cylinder 1-3 (2).
Release oxygen monitoring sensor (1) with special tool 11 7 020 with a suitable extension.
Tightening torque 11 78 1AZ .
Installation:
Pull in monitoring oxygen sensor (1) and install.
Tighten oxygen monitoring sensor (1) with special tool 11 7 020 with a suitable extension.
Tightening torque 11 78 1AZ .
Connect and lock yellow plug connection of monitoring oxygen sensor, cylinder 1-3 (2).
Connector (2) must snap audibly into place.
Required follow-up work:
- Install STIFFENING PLATE .
- Install REAR ENGINE GUARD .