Recalibrate outside temp display???

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Mazda CX5 GTR 2019
After having some work done on the audio system, my outside temp gauge is suddenly reading low -- like 30 degrees low. Does anyone know of a way to recalibrate or reset the temp gauge?

FiveG
 
I don't. I'm surprised that none of the CX-9 tech heads haven't chimed in. How well do you know the service advisor at your dealership. Would he or one of his guys know?
Craig
 
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