Could be the TDC Sensor, sometimes called the crankshaft Sensor.
Because it is rubbish :0
No. The engine starts the car.
A bad freeze plug will leak coolant and cause the engine to overheat.
No fuel (out, or pump not pumping) or no spark (or really bad timing).
Bad spark plugs can have a variety of effects on the performance of your car's engine. Signs of bad spark plugs include a rough idle, engine hesitation, hard starting, check engine light illuminated with a DTC P0300 and reduced engine power.
Hard starting and engine stalling. Eventually the filter will become completely clogged and the engine will not start.
hard starting in the morning. It could also mean hard starting when the engine is warm. If the sensor is bad, and the car is warm, it could be telling the computer the engine is cold, therfore making the warm engine hard to start because it will be telling the computer to add more fuel and the engine doesn't need it.
Engine coolant sensor may be bad
Weak battery, or starter going bad.
Lock up, No but a bad crank sensor will prevent the engine from starting.
Yes, you need spark for the engine to run.
symptoms of a bad sensor will be , engine cutting out then starting again as you drive. cutting out then being able to restart when vehicle is stopped. hard starting. if left long enuff before replacing, you will not be able to restart