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Which message do some vehicles display for that fault?

  • A.Nothing, since the fault is reported only as a code and requires diagnostic equipment to be identified
  • B.Engine fault
  • C.A dedicated message asking the driver to check the filler cap, which avoids an unnecessary visit to a workshop
  • D.A check fuel cap message

Answer: D

A specific message saves the owner an unnecessary trip. The last option explains exactly that purpose, which makes it a correct and more instructive version of the same answer. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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