Cam position sensor

[Campbell]

P0366 

I Recently bought a 2012 astra sri, the eml came on with code P0366 cam position sensor. The previous owner has left a receipt in the car confirming that the cam position sensor had been replaced. Is it possible that the other sensor is failing also? 

The car runs OK but is a bit gutless and my wife has told me failed to start a few times with her. She has turned off and it then starts OK. 

Any help much appreciated 

[Vauxhall Owners Club]

Be aware that it could be a loose (worn) cambelt/camchain and this leads to the cam sensor being out of phase with the crank sensor

If there is any rattling coming from the engine or an overdue oil and filter change then it would be prudent to look at this before spending big money on replacement parts