I have inherited a tyre pressure sensor off a 2015 Auris.
For all those who wondered what one looks like off of the wheel, here are some photos.
I think the pressure is measured up the small hole to the left in the first picture.
The air enters the tyre through the vaguely triangular aperture.
Once the button cell battery has gone flat, then the whole unit gets swapped out. (5+ years?)
