Necessary preliminary tasks:
- Remove reinforcement plate
- Remove complete exhaust system, refer to 18 00 020 REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (M54)
- Remove air pump
NOTE:
The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.
Remove rear control sensor. Refer to 11 78 512 REPLACING OXYGEN CONTROL SENSOR (CYLINDERS 4-6) .
Remove cover from fuel injectors.
NOTE:
Do not mix up monitor sensors for cylinders 1 to 3 and 4 to 6 at plug connection to wiring harness.
Mark plug connections.
Unclip cable from holder. Disconnect plug connection. Unclip cable on rear side of engine from cable guide.
Remove monitor sensor from cylinders 4 to 6. Refer to 11 78 612 REPLACING OXYGEN MONITOR SENSOR (CYLINDERS 4-6) .
Unscrew nuts.
Remove exhaust manifold (1).
Installation:
Clean sealing faces, replace gaskets.
Replace nuts.
Tightening torque 11 62 1AZ. Refer to ENGINE - TIGHTENING TORQUES .