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That has been my understanding on most cars with outside temp sensors. Apparently many manufacturers mount them somewhere near the front bumper. I know my parents had a BMW where the sensor was obviously located in the bumper (you could see it) and if it had water in the opening such as after a car wash, it definitely gave an incorrect reading. As for a calibration, I think they're "permanently calibrated" which is unfortunate but I suppose if you have a general idea how far off it is given a particular reading it makes it easier to tell a more accurate reading.
 
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