Car makers have to supply smog parts for eight years. Which pretty much means all engine parts and engine computers as well as valves hoses etc. My ex neighbor bought a engine fire Dae Wo after it had stopped selling in the USA. He was able to get the underhood wiring harness from 40 miles away from a Hyundai? dealer who had bought or been given the rights/responsibility to stock smog parts.
The eight years may be a California thing but I thought it was federal.
Bil lD
On edit: they have to repair any car so it meets epa rules for 8 years after manufacture. They do not have to make the parts but they have to replace anything, at their expense, that needs replacing. I suppose they could simply buy back any non compliant vehicle and destroy it instead.