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I bought a car umbrella from Amazon at SaiEl International based in Japan. But I am sure you can find a similar one online nearby your location. Please see my attached photo.
The same thing happened to me and I was instructed by Peugeot Dealer to unplug it. Apparently, even if you replace it with a new one same issue will re-occur.
Now I have unplugged it no more worries. But please ensure to wrap a tape around the unplugged parts for water protection. See attached...
I had the same issue and my Peugeot dealer adviced to unplug the sensor and wrap it with a waterproof plastic. I guess this is a permanent solution but will have to check from time to time your coolant level. I hope this help.