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 nuts (1) and (2).

Tightening torque 18 20 1AZ .

Fig 1: Identifying Catalytic Converter Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Release clamp (1). The clamp must be renewed every time it is removed.

Tightening torque 18 31 2AZ .

In so doing, secure catalytic converter against falling out.

Feed out catalytic converter and remove.

Installation note:

Clean sealing surface. Renew clamp and seal.

Fig 2: Identifying Catalytic Converter Clamp

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check exhaust system for leaks.