Why does Hyundai not start crankshaft sensor?

This question is asked poorly. Are you having trouble starting your Hyundai, or having trouble with your crankshaft sensor? Asking your question correctly will get you the correct answer. If your car isn't starting, I would suggest looking over the cranking system. (Battery, alternator, starter etc)... To find out if your crankshaft sensor is a problem, you could use a computer diagnostic tool.