Rick's Free Auto Repair Advice

Symptoms of a failing crankshaft sensor

What are the symptoms of a failing crankshaft sensor?

Since the crankshaft sensor controls the fuel injectors, a failed or failing sensor can cause starting and performance problems. For more information on the difference between a crankshaft sensor versus a crankshaft sensor, see this post. Here are the symptoms of a failing crankshaft sensor.

A failing crankshaft sensor can cause:

Hard starting — engine will crank but has a hard time “firing up.” The problem may be consistent or may occur only when cold or hot. Either way, the engine cranks but won’t fire up because it’s not getting fuel or not getting fuel at the right time.

No start — engine cranks but won’t fire up at all. No fuel in the cylinder or not enough fuel in the cylinder. If you remove a spark plug and it’s wet, that proves the crankshaft sensor is activating the fuel injectors.

Misfires — a weak signal from the crankshaft sensor can cause misfires, lack of power and poor gas mileage

Check engine light — A failed crankshaft sensor will trigger a check engine light. A crankshaft related trouble code may be accompanied by misfire codes. In that case, fix the crankshaft related code first.

Posted on by Rick Muscoplat

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