Coolant warning light

I have what I believe to be a low coolant symbol on the DIS, however the coolant is not low. Is there a sensor somewhere that is at fault, is this a usual fault on these cars? I would like to get this corrected as I have no other lights on the dash. Anyone have any ideas?

Cheers

I think sensor is bottom of bottle and not sure u can change it I think u have change the bottle! But some1 will correct me lol

The 2 prong sensor in there gets coated up to point it can't read anymore so sends out warning

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thank you. Sounds like it may be possible to clean it up?