Self Study Program 446 – The 2.5L TDI EURO V engines with SCR system in Crafter

VAG SSP 446. 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.

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 2.5l 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.

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


  • Introduction
    • The 2.5l TDI engines with SCR system (EURO V)
    • Technical specifications
  • Exhaust gas treatment system
    • System construction
  • Engine mechanics
    • Engine speed sensor G28
    • Turbocharger
  • Turbocharger
    • Diesel particulate filter
  • SCR system
    • Overview of SCR system
    • AdBlue reducing agent
    • Tank system
    • Functional principle of SCR system
  • AdBlue indicator concept
    • AdBlue indicators in dash panel insert
  • System overview
  • Service
    • Special tools and equipment
    • Topping up the reducing agent
  • Test your knowledge

The self-study programme presents the design and function of new developments!
The content is not updated.
Current testing, adjustment and repair instructions can be found in the applicable service literature.

Language: English
Format: PDF
Pages: 36

Self Study Program 446 – The 2.5l TDI EURO V engines with SCR system in Crafter Design and function PDF free online