What must a vehicle owner do if an emissions-related error code appears on the OBD-II system?

When an emissions-related error code appears on the OBD-II system, it is essential for the vehicle owner to address and resolve the issue before retesting. The OBD-II system is designed to monitor the performance of the vehicle's emissions control system, and error codes indicate that there is a problem that could lead to increased emissions or vehicle malfunction.

Resolving the issue prior to retesting ensures that the vehicle meets the required emissions standards. Ignoring the code or waiting until the next inspection does not address the problem and may lead to further damage or failure of the emissions system. Calling for an emergency inspection is unnecessary when the appropriate action is to fix the issue first. Changing the vehicle's oil, while important for overall maintenance, does not resolve any specific emissions-related issues indicated by the error code. Therefore, taking the proper steps to resolve emissions-related problems is crucial for both compliance with emissions regulations and the overall performance and reliability of the vehicle.