School bus DPF inspection and replacement is a consistent maintenance issue on diesel school buses with Tier 4 emissions systems. Short-run duty cycles, frequent stops, and inconsistent regen cycles make DPFs on school buses work harder than on over-the-road trucks. Why School Bus DPF Inspection and Replacement Is a Recurring Issue School bus DPF failure follows a predictable pattern driven by duty cycle. Short routes prevent passive regen from completing because exhaust temp
