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Which process does that lower temperature oxidation enable?

  • A.Active regeneration, which requires additional fuel to be injected in order to raise the temperature of the filter
  • B.Nothing
  • C.Ongoing removal of soot without any intervention, provided the exhaust remains above the required temperature
  • D.Continuous passive regeneration during ordinary driving

Answer: D

Passive regeneration removes soot continuously without any special measures. The last option explains exactly that, which makes it a correct and more instructive version. Active regeneration is the fallback. Naming what changes and what stays the same is the reliable route through questions of this shape. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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