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

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 BMW X3, 2016 BMW X3, 2015 BMW X3, 2014 BMW X3, and 2013 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.

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

Necessary preliminary work:

Remove front UNDERBODY PROTECTION .
Remove EXHAUST SYSTEM .

NOTE: There is a risk of damaging the oxygen sensor while removing and installing the catalytic converters.

REMOVE THE CONTROL SENSOR .

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

Tightening torque: 18 31 2AZ .

Installation note:

Clean sealing surface. Renew clamp and seal.

Fig 1: Identifying Catalytic Converter Clamp

G09847551

Courtesy of BMW OF NORTH AMERICA, INC.

Unclip cable (2) from monitor sensor out of holder.

Fig 2: Identifying Monitor Sensor Cable

G09945470

Courtesy of BMW OF NORTH AMERICA, INC.

Unscrew nuts (1).

Tightening torque: 18 20 1AZ .

Feed out catalytic converter (2) and remove.

In so doing, secure catalytic converter against falling out.

Fig 3: Identifying Catalytic Converter And Nut

G09946267

Courtesy of BMW OF NORTH AMERICA, INC.

Reinstall MONITOR SENSOR when replacing the catalytic converter.

Reassemble the vehicle.

Check exhaust system for leak tightness.