Practice question

What happens if a modern Euro 6 truck runs completely out of AdBlue / DEF while on a journey?

  1. Engine management software enters an emissions torque derate mode (reducing engine power by 25–40%) and prevents restarting once turned off until fluid is refilled
  2. The truck explodes
  3. The truck switches to petrol mode
  4. The brakes fail completely

Answer: A — Engine management software enters an emissions torque derate mode (reducing engine power by 25–40%) and prevents restarting once turned off until fluid is refilled

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