Hi there. My 1.4tdi has similar intermittent warm start problem. Reading the above it disconnected the can sensor but engine would not start at all. Suspected tandem pump but measured fuel pressure at pump and was above the 3.5bar spec at idle and rose to maybe 4.5bar at faster engine speed. Needle was a blur because of pressure pulses. Anyway I'm wondering if its the cam sensor that will stop the engine starting rather than the crank sensor?