Discussion
Which fault does a failed crankshaft position sensor produce?
Answer: B
Without a crankshaft signal the controller does not know where the engine is and will not fire the coils or injectors. Intermittent sensors genuinely do cause cutting out and rough running, which makes the last option a real symptom of a failing rather than failed sensor. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.
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