Necessary preliminary tasks

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2010 BMW 335xi, 2010 BMW 335i, 2009 BMW 335xi, 2009 BMW 335i, and 2008 BMW 335xi. However, it is still accessible from the selected car via links, so may be relevant.

Remove underbody protection.
Remove EXHAUST SYSTEM .
Remove cable clip on side of transmission for control sensor/monitoring sensor.

All-wheel drive vehicles only:

Remove right bearing support.

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

Remove monitoring sensor from cylinders 1 to 3. See 11 78 545 REMOVING AND INSTALLING/REPLACING BOTH LAMBDA OXYGEN MONITOR SENSORS (N54) .

Remove control sensor, cylinders 1 to 3. See 11 78 513 REMOVING AND INSTALLING/REPLACING BOTH LAMBDA OXYGEN CONTROL SENSORS (N54) .

Unscrew nuts.

Tightening torque 18 20 2AZ .

Fig 1: Locating Nuts

G08419461

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws.

Tightening torque 23 00 2AZ .

Remove holder (1).

Fig 2: Identifying Screws And Holder

G08419462

Courtesy of BMW OF NORTH AMERICA, INC.

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

Feed out catalytic converter (1) towards bottom and remove.

Installation note:

Clean sealing surface. Replace seal and clamp.

Tightening torque 18 31 3AZ .

Fig 3: Identifying Catalytic Converter

G08419463

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Secure installation position of catalytic converter with special tool 18 0 110 .

Fig 4: Identifying Special Tool 18 0 110

G08419464

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check exhaust system for leaks.