What happens if a customer does not challenge the emissions test results within the specified period?

If a customer does not challenge the emissions test results within the specified period, the results become final. This means that once the designated time for contesting the test outcomes has elapsed, the results are officially accepted and cannot be disputed. This finality is important for maintaining the integrity of the emissions testing process and ensuring that all vehicles comply with regulatory standards.

In the context of the options provided, a retest may be possible if the challenge is made in a timely manner, but failure to challenge means no retest can be conducted. Likewise, the chance for a refund or the requirement to pass a different test does not apply in this situation. The regulations are designed to create a clear and definitive process, allowing for certainty in compliance with emissions standards once the challenge period has passed.