I have read somewhere that the water sensor in the TD5 that is located in the fuel filter is known to be temperamental.
Mine seems to have taken to having a day when it is on and then flicker a bit the next day. I have changed the filter - there was absolutely no water that came out before the diesel - and cleaned the end of the sensor (wiped the slight debris off it) but no change - if anything it is more positively on.
Is the solution a replacement sensor?
Thanks
David (Defender 90 TD5)