18 32 050 Removing and Installing/Replacing Catalytic Exhaust-Gas Converter for Cylinders 1-3

18 32 050 Removing and Installing/Replace Catalytic Converter For Cylinders 1-3 (N54, N54T)







WARNING:
Risk of burning.
This repair work may only be carried out on an exhaust system which has cooled down.







Necessary preliminary tasks:
- Remove underbody protection
- Remove exhaust system.
- Remove cable clip on side of transmission for control sensor/monitoring sensor.
- All-wheel drive vehicles only:
Remove right bearing support.







NOTE:
The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.
Remove monitoring sensor from cylinders 1 to 3.
Remove control sensor, cylinders 1 to 3.







Unscrew nuts.
Tightening torque 18 20 2AZ.







Release screws.
Tightening torque 23 00 2AZ.
Remove holder (1).







Unfasten clamp. In so doing, secure catalytic converter (1) against falling out.
Feed out catalytic converter (1) towards bottom and remove.

Installation note:
Clean sealing surface. Replace seal and clamp.
Tightening torque 18 31 3AZ.







Reassemble the vehicle.
Check exhaust system for leaks