Hey all...first time poster long time reader.
I have recently had a problem with my low coolant sensor tripping my dash light. It was real confusing because sometimes it was low and other times it was not. My light was on for a few days and I read many posts here (thanks again) and decided to go buy the sensor at fifty bucks...ouch. As these things seem to work, driving home from the parts store the stupid light went out (along with more of my hair).
To make a long story a little shorter I found out my radiator cap wasn't sealing and was dumping my coolant instead of putting it the overflow tank and it required a 5 dollar cap and not the sensor.
If you do have to replace your sensor tho, I figured out that if you remove your passenger headlight it is alot easier than removing your battery as many have posted to do. You might have to loosen the battery hold down to push the battery back a little, but removing it is unnecessary.
Hope this helps.