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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.

Asked by for the 2004 BMW 325i
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.