hi,i'm having problem with my 1.9tdi 04 galaxy and looking for some advice pls. first time it starts up fine i can drive as long as i want,then second time if it starts straight away then its ok but if it takes long to start which it does, then it will cut off straight away or it will run anything between 200yrds and a few miles,then cut off again. diagnostic shows d40 fault. can it be cam sensor? any advice pls.