Hiya, I've had the same problem, almost identical symptoms. I took it into a garage after reading this and asked them to plug it in to see if there was any faults with the sensors. No faults were found and after further investigation and they told me that it could have been one of the valve guides leaking a tiny bit of oil when the engine is stopped and hot (Making it difficult to start, but not impossible, as it would start once the oil had been flushed out of the system after a few attempts of starting). They told me that if it was this that was going wrong it was a simple washer that needed replacing but would have been a £500 job in order to get to it as the engine would of had to have been taken apart etc... I was wondering if the replacing the sensor has fixed the problem in the long run or have you had any problems since posting this? As if it has sorted it I think i'll replace them regardless of the computer readings as a £30 job may (hopefully) sort it. Jack