if it turns over and will not start it could be a crank shaft position sensor.
had two d2s let me down in this way.will start up after cooled down and run for a while and stop again.progressively gets worse and will not start at all.if it dies for no reason while driving and starts up 1/2 hour later this could be the problem.bloody german sensors and electrics lol.pay back for ww2 i guess.
brett