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Which check applies when diagnosing a network fault on a modified vehicle?

  • A.Look for aftermarket devices connected to the bus
  • B.Read the fault codes only, which identify the module responsible and therefore require no further inspection
  • C.Nothing special
  • D.Inspect for non standard splices and additional modules, since these are a frequent cause of bus disturbance

Answer: A

Trackers, alarms, dashcams and immobilisers spliced into the harness are the first thing to look for. The last option describes exactly that inspection, which makes it a correct and more detailed version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The shared behaviour explains why these belong together and the differences explain why both exist.

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