18 32 050 Removing and installing/replacing catalytic converter (N55)

WARNING: Risk of burning!
Only perform this repair work after the exhaust system has cooled down.

Necessary preliminary tasks:

NOTE: The oxygen sensors are in danger of being damaged when the catalytic converters are removed and installed.
REMOVE THE CONTROL SENSOR .
REMOVE MONITORING SENSOR .

Release clamp (1).

Tightening torque 18 31 2AZ .

Installation note:

Clean sealing surface. Renew clamp and gasket.

Fig 1: Identifying Clamp

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Tightening torque 18 20 1AZ .

Unscrew nuts (2).

Tightening torque 18 20 4AZ .

Feed out catalytic converter and remove.

Fig 2: Identifying Screw And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check exhaust system for leak tightness.