[CREWZIN]

NO, it has nothing to do with starting the car. If the oil (pressure) sensor itself goes bad, 2 things could happen. The (idiot) light on the dash will come on or it will continue to work (no light) and will leak oil all over the engine and the ground.

If the sensor is good and your light goes on, it means your oil pressure is low from a bad pump or your low on oil.

P.S. You said you changed the plugs but not the wires. The original plug wires are notoriously a weak point in the ignition system. They cause all kinds of problems. If you still have the OEM wires on, change them to anything but new stock wires from the dealer. They can also cause a weak starting condition if low spark is getting to the plugs.