Aftertreatment Mastermind
DPF, DOC, SCR, DEF dosing and the derate ladder — taught the way a working tech has to think about them. Read the data, prove the root cause, verify the repair.
Every lesson, quiz, the diagnostic simulator and the final exam are included with Blue Collar Empire Pro.
Curriculum
Aftertreatment System Fundamentals
Why modern diesels need aftertreatment & how every component fits
DPF Operation & Diagnostics
Soot, ash, regeneration, and reading differential pressure correctly
Exhaust Temperature Diagnostics
Proving sensor vs wiring vs actual temperature problems
DPF Differential Pressure Diagnostics
Pressure sensors, tubes, and false restriction readings
Regeneration Masterclass
Why this truck won't regen — and how to find out
DEF System Diagnostics
Chemistry, quality, contamination, and frozen DEF
SCR System Diagnostics
Engine-out NOx → SCR → downstream NOx, end to end
NOx Sensor Diagnostics
A NOx code does not mean the sensor is bad
Electrical Diagnostics for Aftertreatment
Voltage, ground, reference, signal, CAN — and voltage drop
Fault Code Diagnostic Mastery
A universal strategy, not a code list
Live Data Diagnostics
One PID rarely tells the whole story
Real-World Aftertreatment Diagnostic Cases
20+ cases where the obvious component is not the problem