Diesel Aftertreatment Emissions System Training

Fault codes related to diesel aftertreatment system often result in inconvenient vehicle downtime and expensive repair costs.  Technicians who are trained specifically in diesel aftertreatment system theory and operation can prevent system failures, reduce fault codes, minimize vehicle downtime, and most importantly significantly reduce expensive maintenance and repair costs.

This one-day course, based on EPA diesel emission regulations, spans all major engine manufacturers, and teaches technicians troubleshooting and service procedures surrounding current diesel engine aftertreatment emission control systems.

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Delivery Mode

Virtual Training

Who Should Attend?

Technicians with at least basic skills in heavy-duty vehicle repair, responsible to maintain, diagnose diesel engine aftertreatment emission control systems.

Course Objectives

  • Describe the progression of Diesel Engine Emission Control History & Technology Advances
  • List the three major emissions being reduced using diesel aftertreatment technology
  • Describe the function of exhaust gas recirculation (EGR) in diesel engines
  • Describe the operation and diagnostic procedures of the Diesel Oxidation Catalyst (DOC) & Diesel Particulate Filter (DPF)
  • Describe the operation and diagnostic procedures of the Diesel Exhaust Fluid (DEF) System in relation to the Selective Catalytic Reduction (SCR) Catalyst
  • Interpret Fault Code Troubleshooting Logic
  • Implement aftertreatment maintenance, troubleshooting techniques and diagnostic tests

Course Outline

Module 1 Introduction to Emission Control Systems
Module 2 Fundamentals of Exhaust Gas Recirculation (EGR) for Diesel Engines
Module 3 Diesel Particulate Filter (DPF) Systems: Operation, Maintenance & Troubleshooting
Module 4 Selective Catalytic Reduction (SCR) System: Operation, Maintenance & Troubleshooting
Module 5 Heavy-Duty On-Board Diagnostics (HD-OBD): Operation, Diagnostics & Troubleshooting Fault Codes
Module 6 Greenhouse Gas Reduction: Aftertreatment and Fuel Economy


Instructional staff members of colleges, universities, private training organizations, fleets, dealers or manufacturers are not candidates for this course, but have numerous options for bringing NGVi’s training classes to their campuses or facilities. For more information, contact us at 800-510-6484.