18 00 018 Removing and refitting complete exhaust system (N47 D20 O 1 with SCR)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2016 BMW 328i xDrive, 2016 BMW 328d xDrive, 2015 BMW 328i xDrive, 2015 BMW 328d xDrive, and 2014 BMW 328i xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

31 2 220

WARNING: Risk of burning!
Only carry out this repair work when the exhaust system has cooled down.

IMPORTANT: Removal of the exhaust system must be carried out with the assistance of a second person.

Necessary preliminary tasks:

REMOVE MONITORING SENSOR .
Remove EXHAUST TEMPERATURE SENSOR on nitrogen oxide catalytic converter.
Remove rear UNDERBODY PROTECTION .

Support exhaust system with jack and special tool 31 2 220 or other suitable special tool and secure against falling down.

Fig 1: Supporting Exhaust System With Special Tool (31 2 220)

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Release screws (1).

Remove underbody panelling (2).

Fig 2: Identifying Underbody Panelling And Screws

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Release bolts along line (1).

Remove cover from below rear silencer.

Fig 3: Identifying Rear Silencer Cover

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Release clamp (1).

If necessary, replace clamp.

Part: Clamp

Tightening torque 18 31 2AZ .

Fig 4: Identifying Clamp

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Slacken nut (1).

Tightening torque 18 20 4AZ .

Fig 5: Identifying Nut

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Release clamp (1).

Tightening torque 18 31 7AZ .

Pull metering unit (2) out of the exhaust system and tie to one side.

Do not disconnect pipes.

Fig 6: Identifying Exhaust System Metering Unit And Clamp

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If fitted:

Release screws (1).

Tightening torque 18 20 6AZ .

Remove reinforcement plate (2).

Fig 7: Identifying Reinforcement Plate And Screws

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Detach the diesel particulate sensor (1) and place to one side.

Tightening torque

Detach nitrogen oxide sensor (2) downstream of SCR catalytic converter and place to one side.

Tightening torque

IMPORTANT: When unscrewing the nitrogen oxide sensor take care that the lead is not damaged.

Fig 8: Identifying Diesel Particulate Sensor And Nitrogen Oxide Sensor

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Release nut and remove holder (1).

Tightening torque 18 31 3AZ .

Fig 9: Identifying Holder

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Unfasten nut.

Tightening torque 18 20 4AZ .

Fig 10: Identifying Nut

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Slacken nut (1).

Tightening torque 18 20 4AZ .

Lower and remove exhaust system with assistance of a second person.

Fig 11: Identifying Nut

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Installation note:

Check exhaust system for leaks.