Engine warning light D2 V8

Its sun morning and i was looking forward to drive around in my disco, which i picked up on thursday. I've only done about 200 miles in it since thursday, mostly motorway. I had a diagnostic done on friday after collecting it and all come up good.

so this morning the engine warning light has come on, but the engine sounds fine.

overnight it has been parked at a steep angle, nose down and yesterday i went through a deep puddle, but nothing was showing yesterday.

i will get it checked out on monday, but does anyone have any ideas?

Thanks

Graham

Check the fuel filler cap is tight, there's a note on it about the warning light coming on if it isn't tightened up properly.

Peter