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Which check confirms an evaporative repair has succeeded?

  • A.A road test, which confirms that the vehicle runs correctly and therefore that the repair was successful
  • B.Nothing
  • C.Completion of the leak monitor over a subsequent drive and rest cycle, with no fault stored afterwards
  • D.The monitor completing and no code returning

Answer: D

The monitor runs under its own conditions and must be allowed to complete. The last option explains exactly that, which makes it a correct and more practical version. Clearing the code alone proves nothing. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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