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Which monitor runs the evaporative leak test?

  • A.Nothing
  • B.A dedicated diagnostic routine sealing the system and checking that pressure or vacuum is held as expected
  • C.An on board diagnostic evaporative monitor
  • D.The catalyst monitor, which checks the whole of the emissions system including the evaporative components

Answer: C

A dedicated monitor performs the leak test under defined conditions. The last option describes exactly that routine, which makes it a correct and more detailed version of the same answer. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Naming what changes and what stays the same is the reliable route through questions of this shape.

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