Remove the catalytic converter for cylinders 1 to 4

Preliminary work 

• Refer to REMOVING THE REAR AXLE COVER .
• Refer to IF INSTALLED: REMOVING THE TORSION STRUT ON THE RIGHT AND LEFT WHERE REQUIRED .
• Refer to REMOVING THE REAR DIFFUSER .
• Refer to REMOVING THE CONNECTING SUPPORT FROM THE TUNNEL .
• Refer to REMOVING EXHAUST SYSTEM .
• Refer to REMOVING THE ACOUSTIC COVER .
• Refer to REMOVING INTAKE SILENCER HOUSING .
• Refer to REMOVING THE COVER OF THE ENGINE COMPARTMENT AT THE REAR LEFT .
• Refer to REMOVING THE COVER OF THE REAR RIGHT ENGINE COMPARTMENT .
• Refer to REMOVING LEFT AND RIGHT WIPER ARM .
• Refer to REMOVING THE COWL COVER .
• Refer to REMOVING THE SEAL FOR THE HOOD REAR .
• Refer to REMOVING TRAILING LINK AT SPRING BOLT .
• Refer to REMOVING THE COWL UPPER PART IN THE CENTER .
• Refer to REMOVING THE LAMBDA OXYGEN SENSOR AND THE MONITORING OXYGEN SENSOR FOR CYLINDERS 1 TO 4 .
• Refer to REMOVING THE LAMBDA OXYGEN SENSOR AND THE MONITORING OXYGEN SENSOR FOR CYLINDERS 5 TO 8 .
• Refer to REMOVING ENGINE VENTILATION LINE .
• Refer to REMOVING UPPER HEAT SHIELD .
• Refer to RELEASING SCREW BETWEEN THE LEFT AND RIGHT HEAT SHIELD .
• Refer to REMOVING RIGHT HEAT SHIELD .
• Refer to BENDING THE HEAT SHIELD TO THE REAR .
• Refer to REMOVING VACUUM PUMP .

• Release the nuts (1)  at the bottom on the catalytic converter for cylinders 1 to 4.
• Loosen catalytic converter from holder.

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• Loosen clamp (1)  and remove.

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• Loosen screws (1)  .
• Loosen screws (2)  .
• Loosen screw (3)  .
• Remove holder (4)  .

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• Lift catalytic converter for cylinders 1 to 4 (1)  upwards.

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• Unscrew catalytic converter for cylinders 1 to 4 (1)  upwards and remove.

  Courtesy of BMW OF NORTH AMERICA, INC.