camshaft sensor HELP PLEASE

My grandson just got a Micra E 53 plate, he goes out in the car returns and it wont start has to leave for up to a couple of hours before it will start again. It also seems to rev it's self up .we took the car into garage put it on the computer and it came up camshaft sensor . So does this mean it only wants sensor or will there be anything else wrong with the car especially when it revs it's self up.Hope someone can help me as grandson just passed his test and its his first car thank you for any help