Removing and installing/replacing oxygen control sensor of cylinders 1-3 (S55 engine)
Special tools required:
- 11 7 030
- 11 9 150
- 11 4 260
Work should only be carried out on an exhaust system that has cooled down.
Necessary preliminary work:
- Remove both charge air ducts. Refer to REMOVING AND INSTALLING/REPLACING CHARGE AIR DUCT OF CYLINDER 4-6 and REMOVING AND INSTALLING/REPLACING THE CHARGE AIR DUCT FOR CYLINDERS 1-3 .
- Remove STIFFENING PLATE .
Removal:
Unlock and disconnect plugs (1).
Release connector (1) from clamp (4).
Release connector (2) from clamp (3).
Release oxygen control sensor (1) with special tool 11 4 260 with a suitable extension (2).
Feed out and remove the front oxygen sensor (1).
Installation:
Installation note:
The threads of new monitoring oxygen 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 system branch (sensor ceramics) must not be cleaned and not coated with lubricant.
Insert front oxygen sensor (1) and install.
Tighten front oxygen sensor (1) with special tool 11 4 260 with a suitable extension (2).
Tightening torque 11 78 1AZ .
Connect the connector (1) on the connector (2) and lock.
Connector (1) must engage audibly.
Attach connector (1) to clamp (4).
Attach connector (2) to clamp (3).
Required follow-up work:
- Install both charge air ducts. Refer to REMOVING AND INSTALLING/REPLACING CHARGE AIR DUCT OF CYLINDER 4-6 and REMOVING AND INSTALLING/REPLACING THE CHARGE AIR DUCT FOR CYLINDERS 1-3 .
- Install STIFFENING PLATE .