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 2010 BMW 535i, 2009 BMW 535i, and 2008 BMW 535i. 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 EXHAUST SYSTEM .
Remove underbody protection (if applicable)
Remove cable holder on side of transmission for control sensor/monitor sensor
In all-wheel-drive vehicles: Remove RIGHT BEARING BLOCK

NOTE:

The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.

Remove CONTROL SENSOR, CYLINDERS 1 TO 3

Remove MONITOR SENSOR, CYLINDERS 1 TO 3

Unscrew nuts.

Tightening torque 18 20 2AZ .

Fig 1: Locating Nuts

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Release screws.

Remove holder (1).

Fig 2: Identifying Holder With Screws

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

Remove catalytic converter (1).

Installation:

Clean sealing face and replace seal.

Tightening torque 18 00 3AZ .

Fig 3: Identifying Catalytic Converter

Courtesy of BMW OF NORTH AMERICA, INC.