What should an inspector do if they encounter an unknown failure code during an emissions test?

When an inspector encounters an unknown failure code during an emissions test, the most appropriate action is to research the code and consult resources for troubleshooting. This approach is essential because failure codes are indicators of specific issues that may affect the vehicle's emissions performance. Understanding what the code signifies helps in accurately diagnosing potential problems, ensuring that the emissions test results are valid and reliable.

By consulting available resources or databases, the inspector can gain insights into the nature of the code, its associated symptoms, and potential solutions. This methodical approach not only adheres to industry best practices but also enhances the inspector's knowledge and capability to inform the vehicle owner about necessary repairs or adjustments to ensure compliance with emissions standards.

In contrast, ignoring the code would overlook important information that could influence the test outcome and lead to an inaccurate assessment. Asking the vehicle owner for details might yield some good information but is often insufficient on its own, as owners may not have the technical understanding to provide relevant insights. Finally, making a guess based on experience lacks the precision and reliability of consulting documented resources, potentially leading to incorrect conclusions or recommendations. Therefore, thorough research and consultation are essential for maintaining the integrity of the emissions testing process.