low engine coolant

i keep on getting the low engine coolant poping up on the DIC and I can't seem to get it to go away and yeah I did put the orange coolant in and filled it. Its not leaking I checked again and its not eating it either. Has anyone had the sensor gone bad? and also I keep getting the clean key wait 3 min everyday so im getting sick of it so do I have to replace the key cylinder to get rid of it or get new keys let me know if anyone has done this.