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Which testing demonstrates that durability?

  • A.Only calculation
  • B.Ageing the after treatment on a bench or accumulating the required mileage, then repeating the emissions test
  • C.Accelerated ageing or an extended mileage accumulation
  • D.Nothing, since durability is assumed and requires no demonstration during the approval of the vehicle

Answer: C

Aged components must still pass the test. The last option describes exactly how that is demonstrated, which makes it a correct and more detailed version of the same answer. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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