Every little thing in the car has a computer and they have kilometers of wire connecting it all. You would need hundreds of Raspberry PIs with CAN and LIN communication capabilities.
While developing a new car each of those computers has a team of developers and testers working for two or more years on that single thing, so in total a few thousand people have touched just the electronics in that car. Even if they cared about your privacy no single person would ever be able to know for sure what software is running on what hardware in every corner of that car.
The only way you’d get a feasible DIY car is with 1950s or 60s technology which is illegal to sell in most developed economies.
Every little thing in the car has a computer and they have kilometers of wire connecting it all. You would need hundreds of Raspberry PIs with CAN and LIN communication capabilities.
While developing a new car each of those computers has a team of developers and testers working for two or more years on that single thing, so in total a few thousand people have touched just the electronics in that car. Even if they cared about your privacy no single person would ever be able to know for sure what software is running on what hardware in every corner of that car.
The only way you’d get a feasible DIY car is with 1950s or 60s technology which is illegal to sell in most developed economies.