> Then you buy a new sensor and put it in, just like you would any other failed part.
In the middle of nowhere?
If you're driving to the middle of nowhere you carry spares and tools.
Source: live in Scotland, frequently drive to the middle of nowhere in a Range Rover.
Until the sensor itself has a microcontroller and does a cryptographic handshake with the other side before it's allowed to work, for "security" reasons obviously.