Warning came up today. Driving fine, got home and went out later and no warning.

Sounds a bit dramatic but I'm guessing a sensor somewhere has picked up a bit of moisture somewhere and it's nothing to panic about?

I believe the sensor is under the fuel filter. Mine did that once, when I splashed through a few deep puddles….

See how you go. Might never come up again….

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

It is a known fault on L322 it could actually be water in fuel , have you run the tank very low or filled up at a different garage lately? On L322 it is normally a sensor in the housing that fails if I remember correctly lack of parts means replacing the housing which costs circa £300 plus labour. 2012 tdv8 Westminster arrived Jan 19 gone Dec 23

200 TDi discovery bobtail gone
RR classic v8 bobtail gone
300 tdi Discovery 3 dr gone

Driven a couple of hundred miles since. It hasn't reappeared and all is good.

Fingers crossed.