Practice question

A school bus diesel has a damaged diesel oxidation catalyst (DOC) face from a contamination event. The MOST likely consequence is:

  1. Improved DPF regeneration
  2. Higher coolant level
  3. Lower fuel consumption
  4. Reduced exhaust temperature management and impaired downstream DPF/SCR performance

Answer: D — Reduced exhaust temperature management and impaired downstream DPF/SCR performance

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Practice more: ASE S2 Diesel Engines (School Bus) Practice Questions - ASE S2 - Diesel Engines (School Bus) Certification Exam →