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I've had the sensor freak out on me before. One time, I turned on the ACC power without starting the car, and it goes off for like 5 seconds and then stops . And then sometimes it would randomly go off when I started the car for a few seconds and then stop. It happened maybe 3-4 times over the course of a week, about 2 years ago, and then never reoccurred since... I never did anything to fix it since it went away on its own before I had a chance to figure out what was wrong. I'm thinking somehow a random air bubble got into the system and got trapped by the sensor or something like that, or maybe some weird electrical problem. *shrugs*
Just keep an eye on underneath the car. If it happens to leak, not knowing you take the car out, you will be stuck on the side of the road.... not fun. If you are not seeing any leaks then it MIGHT be the water O-rings... not a good thing.