18 32 050 Removing and installing/replace catalytic converter for cylinders 1-3 (N54, N54T)

Special tools required:

18 0 110

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. See REAR UNDERBODY PROTECTION and FRONT 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 .

Fig 1: Identifying Nuts

G09859065

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws.

Tightening torque, see AUTOMATIC TRANSMISSIONor MANUAL TRANSMISSION .

Remove holder (1).

Fig 2: Identifying Holder And Screws

G09859066

Courtesy of BMW OF NORTH AMERICA, INC.

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 .

Fig 3: Identifying Catalytic Converter

G09859067

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Secure installation position of catalytic converter with special tool 18 0 110 .

Fig 4: Securing Installation Position Of Catalytic Converter With Special Tool 18 0 110

G09859068

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check exhaust system for leaks.