Today's consumer cars are the most "closed" products. One used to be able to do DIY repairing on most of them ,now constructors do everything so that people can

Today's consumer cars are the most "closed" products. One used to be able to do DIY repairing on most of them ,now constructors do everything so that people cant repair anything by themself,just like Apple products. Parts are sealed,or you need Tool X to open this or that,and of course it is not sold to the public...