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A diesel particulate filter is regenerated by

  • A.Raising the exhaust temperature enough to oxidise the trapped soot
  • B.Backflushing it with compressed air
  • C.Replacing the element at each service
  • D.Washing it with a detergent solution

Answer: A

Soot accumulates in the wall-flow channels until the back pressure calls for a burn, which is achieved by late injection or a fuel burner. Frequent short journeys prevent the filter reaching regeneration temperature, which is a common cause of blockage.

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