Most car components actually do not come from the car manufacturer. For example: Bosch (which is famous for its drilling machines) is also a common manufacturer of engine control units and other parts and got flak for it during the diesel scandal, Knorr Bremse is an industry supplier for brakes on trucks and buses and Takata a supplier of airbags.
Takata actually is the perfect example: no matter what car manufacturer there is, they all ended up on the infamous airbag recall list: https://www.nhtsa.gov/recall-spotlight/takata-air-bags