recently i have changed the ( cam follower -intake valve -exhaust vavle cylinder head gasket - chain tensioner ) which cost me ALOT of money but anyway everything went fine until i tried to turn it on and it did good working but the ESP sign comes on i thought maybe its need to switch off but it wont so i used the computer to see the problem and its comes on the screen ( CAMSHAFT SENSOR G40 16725 ) any one have an idea what do ????? i am deeply looking for ur reply guys !!!