What model year vehicles require an OBD inspection in an emissions county based on the 20-year rolling plan?

The correct answer indicates that vehicles from the past 20 years require an On-Board Diagnostics (OBD) inspection in emissions counties, while vehicles older than that (beyond 20 years) do not need to undergo the OBD inspection but may require a different emissions inspection depending on specific local requirements.

This approach is part of a rolling plan that systematically evaluates vehicles based on their emissions standards and age, targeting those models that are more likely to have emissions-related issues. The 0-20 year range includes newer vehicles that must meet current emissions standards, while the vehicles older than 20 years often either do not require emissions testing due to being exempt or may have different criteria based on less stringent emissions regulations.

Understanding this framework helps ensure compliance with the environmental regulations aimed at maintaining air quality and controlling emissions from the automotive sector. This is crucial since newer vehicles are generally equipped with advanced technologies designed to minimize emissions, making OBD inspections an effective means of identifying potential problems.