I have searched and I apologise if this point has been raised before: Fiat Stilo 1.2. ECU comes up with cam shaft position sensor fault even though I have installed a new sensor. Any ideas what it might be?

what 'P code' are you getting?

heres the 'usuals'

P0340 Camshaft Position Sensor Circuit Malfunction
P0341 Camshaft Position Sensor Circuit Range/Performance
P0342 Camshaft Position Sensor Circuit Low Input
P0343 Camshaft Position Sensor Circuit High Input
P0344 Camshaft Position Sensor Circuit Intermittent