Practice question

A school bus diesel exhaust gas recirculation (EGR) cooler is leaking internally. Which symptom would BEST support this?

  1. A worn front tire
  2. A dim dome light
  3. A noisy seat hinge
  4. Coolant loss with white smoke/sweet odor and possible pressurized cooling system

Answer: D — Coolant loss with white smoke/sweet odor and possible pressurized cooling system

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