My Pug 308(2010) with 80k on the odo is giving the Engine Fault:repair required alarm.This usually happens during cold starts.If I do about half an hour drive restart the engine it does not come on.An OBD scan gave fault code as P0016 :Cam/Crankshaft Pos. Correlation sensor A-Bank 1.The engine runs smoothly with normal power and fuel consumption.Any thoughts what is triggering the fault given it is not affecting performance?Timing chain was replaced about 3 years ago.