18 32 050 Removing And Installing/Replacing Catalytic Exhaust Gas Converter For Cylinders 1-3 (N54)
WARNING:
Scalding hazard! Only perform these tasks after exhaust system has cooled down.
Necessary preliminary tasks:
- Remove underbody protection . For Convertible models, see 51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION and 51 47 491 REMOVING AND INSTALLING/REPLACING REAR UNDERBODY PROTECTION . For Coupe models, see 51 47 490 REMOVING AND INSTALLING / REPLACING FRONT UNDERBODY PROTECTION and 51 47 491 REMOVING AND INSTALLING/REPLACING REAR UNDERBODY PROTECTION .
- Remove exhaust system . See 18 00 020 REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (N54) .
- Remove cable holder on side of transmission for control sensor/monitor sensor
- In all-wheel-drive vehicles: Remove right bearing block . See 18 00 020 REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (N54) .
NOTE:
The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.
Remove monitor sensor, cylinders 1 to 3 . Remove control sensor, cylinders 1 to 3 . See EMISSION CONTROL OXYGEN SENSOR .
Remove monitor sensor, cylinders 1 to 3 . Remove control sensor, cylinders 1 to 3 . See EMISSION CONTROL OXYGEN SENSOR .
Unscrew nuts.
Tightening torque. See 18 20 2AZ in 18 20 EXHAUST SYSTEM SUSPENSION .
Release screws.
Tightening torque. See 23 00 2AZ in COMPLETE TRANSMISSION .
Remove holder (1).
Unfasten clip. In so doing, secure catalytic converter (1) against falling out.
Remove catalytic converter (1).
Installation:
Clean sealing face and replace seal.
Tightening torque. See 18 00 3AZ in 18 00 EXHAUST ASSEMBLY .
Installation:
Secure catalytic converter in installation position with special tool 18 0 110.