Re: JTD Water in Diesel
Can appreciate your concern but as I was told when I was having this problem... you should be able to see if theres water in the diesel by checking the exhaust - white clouds/steam quickly confirms the presence of water in the fuel.
From my situation - the first thing that the dealer did was change the filter but as the indicator was still showing, we confirmed it as a definite issue with the sensor. As I remember, the 'Water in Diesel Filter' message was only showing during the first ignition check. After the car was started, switch off the ignition again and then turn back on to reperform the checks. If you have the same issue as me, then the warning indicator won't be shown a second time.
Hope that helps, cheers!