18 32 050 Removing and installing/replacing catalytic converter (N20)

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 tasks:

Remove front UNDERBODY PROTECTION .
Remove rear UNDERBODY PROTECTION .
Remove EXHAUST SYSTEM .

NOTE: When removing and installing the catalytic converter there is the risk of damage to the control sensor and monitoring sensor.
REMOVE THE CONTROL SENSOR .
REMOVE MONITORING 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

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

When installing the catalytic converter make sure that the separation point (1) of the V-band clamp is aligned with the center of the welding spot (2) on the catalytic converter.

This guarantees that the wastegate valve lever does not collide with the V-band clamp.

Fig 2: Identifying Catalytic Converter Separation Point

Courtesy of BMW OF NORTH AMERICA, INC.

Release nuts (1).

Tightening torque: 18 20 1AZ .

Unfasten screws (2).

Tightening torque: 18 20 2AZ .

Unscrew nuts (3).

Tightening torque: 18 20 1AZ .

Remove holder for catalytic converter.

Pull off rubber mounts from the catalytic converter.

Pull out catalytic converter towards the bottom and remove.

Fig 3: Identifying Catalytic Converter Nut And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check exhaust system for leaks.