18 31 140 Removing and installing mixer for exhaust system (M57T2, N57 with SCR)

WARNING: This page is about a different car, the 2013 BMW X5, 2012 BMW X5, and 2011 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

16 1 130

WARNING: Risk of burning!
Only perform this repair work after engine has cooled down.

IMPORTANT: Ensure adequate ventilation in the workbay!
Avoid skin contact (wear gloves)!
Avoid eye contact (safety goggles)!
Urea/water mixture can escape when components carrying urea/water mixture are released. Have a collecting vessel ready.
Observe country-specific waste disposal regulations.

IMPORTANT: Maintain conditions of absolute cleanliness.
Connections and covers of lines carrying urea/water mixture must be cleaned thoroughly with water after each removal or before each installation!
Thoroughly clean the working area with water after repair work.
Use fluff-free cloths for cleaning.
Seal off connections and lines with special tool 16 1 130!
Thoroughly clean special tool with water after each use.

Necessary preliminary work:

Remove FRONT PIPE .

Remove mixer (1) from front pipe.

Replace gasket behind.

Fig 1: Identifying Gasket Of Front Pipe

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: The mixer can be installed the wrong way round. The marked arrow must point in the exhaust gas direction of flow.

Fig 2: Exhaust Gas Flow Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Check exhaust system for leak tightness.

After completing repair work:

Use the BMW Diagnosis System to perform the SCR adjustment.

Refer to:

Service function
SCR systems
Carry out activation and adjustments