Something show wrong and something perfectly true. This morning I went to work and sensor works perfect and when I go home sensor say -1" and "danger ice on road" but outside has been sunny and 20 degrees. I turn off car and go to lunch and when I went back the temperature has been true.

I´ve experienced exactly the same, several times. But I don´t know the reason...
Most of time, the temperature is right but, from time to time, it shows completely wrong values.
I´m also looking forward for some replies on this post.
Thanks!

The same situation with me...

This is the solution to the problem!
Greetings from Hungary!