Would you? I think that EU mandates a mobile connect for emergency services (eCall), but can you point out a legislation which forbits the owner to disable it in the vehicle they own?
The EU-wide "911 eCall" system records your location at all times and has a cellular modem connected to government systems. It is illegal to disable this system. If you still do so, there are fines, and your insurance is no longer considered fully valid in case of an accident.
You asked for specific legislation. For the Netherlands and our "APK" system, the relevant rule is under "Geluidssignaalinrichtingen en eCall", article 5.2.71 of the APK handboek, issued by our Rijksdienst voor het Wegverkeer.
In the EU, automatic surveillance cameras on the side of the road enforce this APK system, so if you do disable the eCall system, you will fail your APK, and you will automatically receive a fine. Even if you don't leave your driveway, the government is working hard to keep you safe; government camera surveillance cars drive around constantly, scanning your license plates, cross-referencing surveillance images with other government databases to automatically issue fines if you step out of line.
I really don't think there's anything to worry about, though; to quote another comment of mine:
>Thankfully, we're safe. Car software is notoriously high quality and rarely hacked. All governments are fully trustworthy, especially around espionage and privacy, and have a perfect track record of never lying to the public.
>Look, the European Commission stated that it cannot be hacked; "hackers cannot take control of it", from ec.europa.eu. They built an unhackable device. I am not sure what you could be worried about. If the government tells you something cannot be hacked, then it cannot be hacked. Furthermore, none of the EU member states have been found using other infrastructure to violate privacy laws.