Maybe someone pressed the automatic remote starter button (if the car has the ARS)
IT MEAN FOR THE ENGINE TO TURN OVER
Yes, and so would bad plug wires.
Ye, it will turn over.
You more than likely have a car with an anti-theft device on it but no "alarm" per say. Most times the keys are coded to that particular car and without the correct key for the correct car it will turn on but not crank. You have to get a key with a chip in it for that make and model of car and then program it to your specific car to start it.
If you locked your own keys in your own car, you would need to call a locksmith to open the door and get them out. You would need to pay him for that service.
A faulty crank sensor would make the engine not run.
starter motor slipping! replace or rebuild!
Does it crank over fine?
Crank shaft
car keys car keys car keys
Sure. There is no law saying that the salesman has to give you more than one set of keys. However, they are not allowed to keep a set of keys to a car they've sold you. That would be unethical and would be illegal in some places.
car will not start if the crank shaft positing sensor is bad ..because it control the car spark plug firing..( no fire no start )