The 2.5L TDI EURO V Engines – Self-Study Programme 446

The 2.51 TDI EURO V Engines with SCR System in Crafter - Self-Study Programme 446 PDF

The 2.5L TDI EURO V Engines with SCR System in Crafter – Self-Study Programme 446. This self-study programme describes the Selective Catalytic Reduction SCR) exhaust gas treatment system for the Crafter.

The worldwide tightening of emission limits for passenger cars and commercial vehicles with diesel engines calls for both the continuous improvement of combustion inside the actual engine and increasingly powerful exhaust gas treatment systems.

The new 2.51 TDI engines in the Crafter are equipped with the SCR (Selective Catalytic Reduction) system. Volkswagen Commercial Vehicles is thus making a further contribution to protecting the environment and combating climate change.

In this self-study programme, you can find out about an exhaust gas treatment system that reduces harmful nitrogen oxides (NOx) in the exhaust gas.

Further information about the SCR system can be found in self-study programme 424 “The Selective Catalytic Reduction exhaust gas treatment system”.

The self-study programme portrays the design and function of new developments.
The contents will not be updated.
For current testing, adjustment and repair instructions, refer to the relevant service literature.



  • The 2.51 TDI engines with SCR system (EURO V)
  • Technical specifications

Exhaust gas treatment system

  • System construction

Engine mechanics

  • Engine speed sensor Turbocharger

Diesel particulate filter

  • Diesel particulate filter

SCR system

  • Overview of SCR system
  • Ad Blue® reducing agent
  • Tank system
  • Functional principle of SCR system

AdBlue indicator concept

  • Ad Blue indicators in dash panel insert

System overview


  • Special tools and equipment
  • Topping up the reducing agent

Language: English
Format: PDF
Pages: 36
Size: 892 Kb
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