I'm guessing they have software that contains a full bill of materials for each vehicle. Boeing does this for every individual plane, and a plane is significant

I'm guessing they have software that contains a full bill of materials for each vehicle. Boeing does this for every individual plane, and a plane is significantly more complex than a Tesla. I'm sure they are very aware of how many of each parts are out there on the road. I wouldn't be surprised if the vehicles themselves periodically phone home with use information so they can predict wear and tear.