the cam sensor is just above the inlet manifold in the middle has a grey plug 3 wires held in by one 8 or 10 mm bolt takes 5 mins to change. the crank senson is located down to back of the engine at the top of gearbox housing a pain to change hidden under pipes and wires.cam sensor is more comon for going wrong.crank senors normaly show a fault due to duel mass flywheel going wrong

cam sensor faults will cause cutting out not just glow plug lamp flashing .if glow lamp flashes it puts a fault code in the pcm . it will take aprox 20 starts with on fault to clear on it own from pcm.