jesus wrote a reply and tis gone lol
ive a 2001 twin turbo legacy, i thought that myself but there's no signs anywhere that it was a separate part, no spaces/blanks etc..
pictures ive found online 'for my car' show two different types, one that seems to be a separate plug, and another thats part of the MAF sensor, little silver pin coming from it,
not being able to find a port for a separate plug led me to think it was on the MAF, but its not there, it does look like there is a place for it there but i dono if the MAF was made generic for a few different models and the IAT sensor was added to some for the models that have it on the MAF.
the fact that it read -40 degrees then got me thinking that if it was part of the MAF and it is missing, that -40 is maybe the minimal value it can read, and its stuck at that, or default reading or something.