Just snip the LTE antenna in a Tesla and you have an offline car. I can't claim to know if Tesla has built in any actively hostile features like the car going i

Just snip the LTE antenna in a Tesla and you have an offline car. I can't claim to know if Tesla has built in any actively hostile features like the car going into a maintenance required mode if it's been too long since a ping home, but I do know that the car is fully operational without connectivity (not including features that required connectivity, like navigation data, of course). There are even physical RFID keys.