Asklemmy

All new cars that I know of come with either online trackers or offline trackers. Some are part of a safety system (like the one automatically dialing the emergency number if you crash), others are part of the infotainment system (live traffic updates, map updates), and then there's the app stuff. A new car carries with it one or more cell phones and anything cellular can easily be tracked (which is even worse if you live in a country where carriers sell live location data to bounty hunters, like the USA).

If you know what you're doing, you can probably take out all the transmitters so you can't be followed live. Data will be stored on computers inside the car, but as long as it doesn't get stolen or sold that data is safe inside. Might void your warranty and pop up a check engine light, though. You should also be wary of disrupting any internal antennae, like the ones for reading pressure sensors and other digital communication inside the vehicle. You may disrupt something and crash your car, and if you survive your insurance will fight tooth and nail not to cover your medical expenses.

If you don't know much about cars or don't want to go hunting for the exact right transmitters, buy an older car.

However, with how many dashcams and traffic cams are installed alongside the road these days, I don't think it even matters much what you do to the car anymore.