The cam sensor is located on the right side of the cylinder head (if your looking at it from the front of the car). I see it happen all the time on neon's. you could say its a common problem. Befor you just go out and replace the sensor check the wiring to it from the pcm, to make sure its not a break in the wires. Other wise theirs not much else that can cause this problem besides it being completely unplugged.