I've tried with Opel from 2004. I had a very modern version (with everything over CAN, even gas pedal) and I had to disconnect A LOT of sensors in order for it

I've tried with Opel from 2004. I had a very modern version (with everything over CAN, even gas pedal) and I had to disconnect A LOT of sensors in order for it to no longer start (don't ask why). Modern diesel cars are a little worse for this, because of all the emissions regulations requiring adblue and dpf filters to work correctly. If you run out of adblue in some cars, you have to get it towed to dealer for checkup and reset.