18 32 005 Removing And Installing/Replacing Catalytic Converter (S54)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW M3, 2005 BMW M3, 2004 BMW M3, 2003 BMW M3, and 2002 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

For Special Tool identification, see Fig 4 .

Special Tools Required:

31 2 220

WARNING: Scalding hazard! Only perform these tasks after exhaust system has cooled down.

Remove underbody protection.

US Version:

Catalytic converters are located in exhaust manifolds.

Remove and install both exhaust manifolds. Refer to 11 62 140 REMOVING AND INSTALLING, SEALING/REPLACING BOTH EXHAUST MANIFOLDS (S54) .

ECE version:

Release screws.

Unclip both plug connections (1) and disconnect.

Disconnect both plug connections.

NOTE: Plastic holder with both cables of monitor sensors is removed with catalytic converter.

Fig 1: Unclipping Both Plug Connections

Courtesy of BMW OF NORTH AMERICA, INC.

Release nut.

Remove holder (1).

Unclip plug connection (2) and disconnect.

Fig 2: Locating Holder And Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw connection of flanges at exhaust manifold.

Fig 3: Identifying Screw Connection Of Flanges At Exhaust Manifold

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Check seals and replace if necessary.

Replace self-locking nuts and screws.

Coat thread with copper paste.

Preliminary tightening:

Tighten screws alternately to locate relevant flange pair.

Final tightening:

Tighten screws to specified.

Tightening torque, (24 N.m.).

Support catalytic converter with jack and special tool 31 2 220 and secure against falling out.

Fig 4: View Of Jack And Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw connection of intermediate pipes at both catalytic converters.

Installation:

Check seals and replace if necessary.

Replace self-locking nuts and screws.

Coat thread with copper paste.

Fig 5: Identifying Screw Connection Of Intermediate Pipes

Courtesy of BMW OF NORTH AMERICA, INC.