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Without a signal from the crank sensor, the ECU won't know how fast the engine is turning or "where it is" (which cylinder is about to fire), and the engine will not run.

If the sensor is just "somewhat bad" (and gives a weak or irregular signal), the engine might do things like run badly at certain speeds, stop occasionally, or have trouble starting.

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Q: What does a faulty crankshaft sensor do to the car?
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