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Which record does a controller keep of a persistent fault?

  • A.A code together with the number of warm up cycles since it last occurred, which determines when it is erased
  • B.A stored code with a counter of drive cycles
  • C.Nothing beyond the code itself, which is retained until it is cleared by a technician using a diagnostic tool
  • D.A photograph

Answer: B

Codes age out after a number of fault free warm up cycles, and the counter records progress. The last option describes exactly that mechanism, which makes it a correct and more specific statement of the same answer. 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 summary, avoids the usual confusion.

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