Real-World Aftertreatment Diagnostic Cases

20+ cases where the obvious component is not the problem

Realistic cases with complaint, codes, freeze-frame, live data, and observations — then 'what would you test next?' with the root cause revealed.

1. 1.Case Methodology & Case Index
2. 2.DPF Restriction From an Upstream Engine Problem
3. 3.Regen Failing: Conditions Not Met
4. 4.DEF Fault From Wiring
5. 5.NOx Fault From a Different System
6. 6.False DPF Pressure From Tubing
7. 7.Sensor vs Actual Temperature Problem
8. 8.SCR Efficiency: Complete System Evaluation
9. 9.More Cases & Final Master Challenge Preview