Thanks for that information. I just don't want to change the sensors to find it's something else. I have had these go before but it's very odd that this time the fault code kicks in about 2 minutes after starting. And most of the time it's on the way home from work, so at home (when the car is kept in a nice cosy garage) I drive 11 miles to work and park in the open air all day, it's the run back home that normally sets it off. Also, I swear that during the first 2 minutes I can feel a very slight hint that the throttle not quite as smooth as normal before the code fault happens. Odd.