According to the inspection rules, what model year vehicles require an OBD inspection in an emissions county?

The correct answer regarding the model year vehicles that require an OBD (On-Board Diagnostics) inspection in an emissions county is based on the regulations that typically apply to vehicle emissions testing. In many jurisdictions, vehicles that are 20 years old and newer often fall under stringent emissions testing requirements, including the necessity for OBD inspections.

An OBD inspection is crucial for ensuring that the vehicle's emissions control systems are functioning properly. Vehicles from the last two decades are equipped with OBD systems that monitor the performance of engine components, fuel system, and emissions controls. This helps in identifying any faults that could lead to increased emissions.

In contrast, vehicles that are older than 20 years may not be subject to the same level of emissions scrutiny as they were manufactured before such technology was widely required. This typically includes older vehicles that might either have simpler emissions controls or none at all, thereby exempting them from modern emissions testing requirements.

Overall, the emphasis on vehicles manufactured within the last 20 years in emissions counties aligns with the broader goals of reducing overall emissions and ensuring that newer vehicles are compliant with environmental standards.