If a vehicle arrives with a nonfunctioning odometer, what should be done during the emissions test?

In the context of an emissions test for a vehicle with a nonfunctioning odometer, the correct approach is to enter 0’s for the mileage when prompted. This option is valid because accurate mileage readings are essential for emissions testing, as they help to assess the vehicle's condition and its emissions over time.

When an odometer is not functioning, it may hinder the tester's ability to report actual mileage, which is important for determining how the vehicle's emissions performance aligns with regulations. Entering 0's allows the testing process to proceed while acknowledging the inability to provide a specific mileage figure. It's important to document this issue, as it informs any future actions regarding the vehicle's maintenance or potential repair needs.

The other choices reflect misunderstandings of how to handle the testing process. Not allowing the vehicle to be tested or requiring repairs before testing can lead to unnecessary delays and could be impractical, especially if the vehicle needs to be tested for compliance with emissions standards. The option of only inspecting the exterior minimizes the scope of the emissions test, which typically requires functional internal systems to assess how well the vehicle meets emission requirements.