Caporegime
[TW]Fox;17483652 said:-40 isnt a wild reading its a specific reading and it means the external temp sensor isn't sending any signal to the car. Usually because its badly damaged or plain missing.
I lost mine when I collided with some junk in the outside lane of the A303
It messes up the climate control as well so you'd need to be a proper ***** to just leave it and not bother to get it fixed.
Oh, I'm sorry! I did not realise that (but had an idea you would!!!) - Dads reads anything from - 40 to + 50 (!) and has done for years.
Numerous trips to BMW has never sorted the issue whilst it was his company car and I guess, now he's a 70+ year old ***** for not wanting to pay out to get it fixed.

Thankfully for him, the climate works.

