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 work:

Remove right ENGINE SUPPORT ARM .
Remove EXHAUST SYSTEM .

NOTE: The oxygen sensors are in danger of being damaged when the catalytic converters are removed and installed.
Remove CONTROL SENSOR , cylinders 1 to 3.
Remove MONITORING SENSOR from cylinders 1 to 3.

Release nuts (1) and (2).

Tightening torque: 18 20 1AZ .

Fig 1: Identifying Nuts Of Catalytic Converter

Courtesy of BMW OF NORTH AMERICA, INC.

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

Tightening torque: 18 31 3AZ .

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 Clamp Of Catalytic Converter

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check exhaust system for leaks.