They had standard to meet that a vehicle of a certain weight/class must not exceed certain amount of emissions. They made vehicles that didn’t meet that standard, shrugged and put them to market anyway because they knew the profits would outweigh any “punishment” fron the spineless regulatory bodies.
The whoe CAFE standards and the shift in car sizes associated with them should be enough evidence to prove the EPA has failed and become disconnected from its true purposes
If you track down the original posts by the victims they have more details about the attack.