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Which limitation does the emissions diagnostic mode have?

  • A.It requires a manufacturer specific tool, which is why generic equipment cannot read the emissions related data
  • B.None
  • C.It covers only the emissions related parameters and codes, leaving every other system to a manufacturer protocol
  • D.It exposes only a defined emissions related subset

Answer: D

Generic mode is deliberately limited to emissions data so any tool can read it. The last option states that limitation and its consequence, which makes it a correct and fuller version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared behaviour explains why these belong together and the differences explain why both exist. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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