Low coolant light keeps coming on. on 2005 BMW 330Ci

I added coolant and it only took 12 ounces. Light went out but came back on after 50 miles. No visible leaks.

by in Mobile, AL on July 07, 2013
1 answer 1 comment
ANSWER by , July 07, 2013
bad sensor
COMMENT by , July 07, 2013
Thanks. I'll have it checked out.