Anyone have a diagram showing location of this sensor? It's not in the little tank where you check the level.
THX
Dave in AZ

 

You're looking for this item (brown)
It's a glass tube that clicks into the base of the header tank, the float inside can stick on it's shaft causing a "LOW COOLANT" message.
This is generally caused by limescale on the shaft. Moving the float up and down with your finger clears the scale so it's back to normal sensing.
It's rare for the sensor to fail - a simple hall effect switch, more likely the float stuck.

 

THX Sean B! would never have looked there. Light comes on every now and then, so thot I'd get ahead of it