Remove the catalytic converter for cylinders 1 to 4

Preliminary work 

• Refer to REMOVE THE CONNECTING SUPPORT FROM THE TUNNEL .
• Refer to REMOVE EXHAUST SYSTEM .
• Refer to REMOVING THE ACOUSTIC COVER .
• Refer to REMOVING INTAKE SILENCER HOUSING .
• Refer to REMOVE THE COVER OF THE ENGINE COMPARTMENT AT THE REAR LEFT
• Refer to REMOVE THE COVER OF THE REAR RIGHT ENGINE COMPARTMENT .
• Refer to REMOVE LEFT AND RIGHT WIPER ARM .
• Refer to REMOVE THE COWL COVER .
• Refer to REMOVE 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 REMOVE THE LAMBDA OXYGEN SENSOR AND THE MONITORING OXYGEN SENSOR FOR CYLINDERS 5 TO 8 .
• Refer to REMOVE ENGINE VENTILATION LINE .
• Refer to REMOVE UPPER HEAT SHIELD
• Refer to RELEASE SCREW BETWEEN THE LEFT AND RIGHT HEAT SHIELD .
• Refer to REMOVE RIGHT HEAT SHIELD .
• Refer to BENDING THE HEAT SHIELD TO THE REAR .
• Refer to REMOVE VACUUM PUMP .

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

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• Loosen circlip (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 in arrow direction and remove.

Courtesy of BMW OF NORTH AMERICA, INC.