18 32 050 Removing and installing/replacing catalytic exhaust-gas converter for cylinders 1-3 (N54)

WARNING: This page is about a different car, the 2013 BMW Z4, 2012 BMW Z4, 2011 BMW Z4, 2010 BMW Z4, and 2009 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Scalding hazard!

Only perform these tasks after exhaust system has cooled down.

Necessary preliminary tasks

Remove front UNDERBODY PROTECTION
Remove rear UNDERBODY PROTECTION
Remove EXHAUST SYSTEM
Release right TIE ROD from steering gear

NOTE: The oxygen sensors are in danger of being damaged when the catalytic exhaust-gas converters are removed and installed.

Remove CONTROL SENSOR , cylinders 1 to 3.

Remove MONITOR SENSOR from cylinders 1 to 3.

Release screws (1).

Remove guard plate (2).

Fig 1: Identifying Screws And Guard Plate

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Unscrew nuts (1).

Tightening torque 18 20 2AZ .

Fig 2: Locating Nuts

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Release screws and remove holder (1).

Replace aluminium screws.

Tightening torque, automatic transmission 24 00 2AZ.

Tightening torque, manual gearbox 23 00 2AZ .

Fig 3: Identifying Holder Screws

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Release clamp. Clamp must be replaced each time it is released.

Tightening torque 18 31 3AZ .

In so doing, secure catalytic converter (1) against falling out.

Feed out catalytic converter (1) and remove.

Fig 4: Identifying Catalytic Converter

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Installation:

Clean sealing face. Replace seal and clamp.

Align catalytic converter to exhaust system connecting piece and tighten down.

Add final details to vehicle.

Check exhaust system for leaks.