Practice question

A school bus diesel has high exhaust back pressure measured before the turbine. This MOST likely indicates:

  1. A normal, healthy exhaust system
  2. A weak battery
  3. A restricted exhaust such as a plugged DPF, collapsed pipe, or damaged catalyst
  4. A loose lug nut

Answer: C — A restricted exhaust such as a plugged DPF, collapsed pipe, or damaged catalyst

The correct answer is shown above. Try the full quiz for additional practice.

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