what dose p11a8 fault code mean ?

I have had this problem with my pug 207 1.4 16v. I plugged it in to the computer a work and it gave me code p11a8 and said it was the camshaft sensor. So i have changed both of them and the problem is still there. Could it possibly be the crankshaft sensor that is causing all the problems and where is it positioned in the engine bay. OR HAS ANY ONE GOT ANY OTHER IDEAS