Coolant (radiator) light comes on and off while driving. on 2004 BMW 325i

My 2004 325i coolant (radiator) light comes on and off while driving. I took the car to the dealer for this problem and they said it was a sensor problem and replaced the sensor and pressure tested the system.

1 answer 1 comment
OK, but did they actually fix the problem, or the warning keeps coming back?
The sensor is a common problem.

Zee
The warning keeps coming back.