Can we prevent cars from sending data to servers if we remove their antennae?

I don't know anything about cars.

Now that we have established that cars seriously undermine our privacy (look at the flurry of posts in this community in the last few hours), what can we do about it?

From a networking POV, if you remove the ability to connect to the Internet, it doesn't matter what the car is recording as long as you can ensure there is no physical tampering. Depending on who you are, this is a good idea, and doable for the most part (very few people have the technical knowledge to pull out the right chip from a car).

So, how do we achieve this? I implore the community to invite mechanical/car engineers who can help us on this matter, and to form methods to prevent vehicles from accessing the Internet without express consent from the user.

Thanks!