Back in the day, before CAN Bus and ECUs, a common way to protect a car from theft from ‘hotwiring’ was to fit a unique anti-theft device. A common example was to interrupt the low-tension circuit to the coils with a simple two-pole switch hidden somewhere in the cabin. Car would simply not start, and even a mechanically literate thief would have to spend hours working out why. The effectiveness of this was due to the unique nature of the deterrent (and probably by the fact that cars were rubbish back then and didn't start half the time anyway).
Surely there must be opportunities for this in a modern car? For example, the accelerator pedal must input a single via a rheostat to the ECU. Can you not interrupt this by a simple switch hidden in the cabin? Thief may start car, but accelerator pedal would not work so unable to drive off. Obviously, this would only work if it was unique. The moment someone sells a system that does this, all the thieves know….
Probably many reasons why this won't work but any thoughts?