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The sensor is most likely kaput. I wrote the P# down somewhere when I was cleaning up the engine compartment, I'll see what I can do in a minute about getting you a link to a new one.
Either went bad, or possible short. Mine was a short on the core support on the driver's side. It's where the bundle goes around, just needed re-wrapping...
I had the same problem but it was the hoses from the water pump. Probably just the sensor as mentioned. Try that first. If the car isnt over heating its probably the sensor. Good luck.