What I don't get is why you're advocating for your own freedoms to be taken away. Don't carry water for the car companies, if they want more freedoms they can use their money and lobby for it. You don't need to do their job pro bono, leave that up to Citizens United.
It's like arguing that you should be able to enter an employment contract that stipulates physical punishment for making mistakes at work - surely, being able to enter such contract is freedom! If you don't like it, go somewhere else, market forces will sort it out! And yet, we as society have decided that no, physical punishment is not acceptable and you cannot waive your right to be free of it. That's freedom. Not what you are saying.
Physical punishment is just a terrible comparison.
Part of the trade-off that large companies accept in being allowed to become mega-players in a space is that to make up for the lack of individual power, the government may step in and make the world better for individuals at the expense of the larger companies by, for instance, mandating freedoms: freedom to repair (especially in the case of cars), freedom to re-sell (that's the first-sale doctrine in case you're curious), and so on.
We're talking about individual freedoms.
Let's be super clear, once you purchase the car, it's not their product, it's your car. That's how ownership works. Once it is in your physical lawful possession, it is your to do with as you please. The entire legal system is built around this idea.
For instance, if someone steals my car and wrecks it, does Volkswagen sue the car thief for damages, or do I? If you answered anything other than Volkswagen, it's not "their product" anymore.