Final answer:
When a vehicle doesn't pass an emission test, the driver usually has a limited amount of time to get the problem fixed and emissions rechecked. The specific time frame can vary depending on the state or country where the test is being conducted.
Step-by-step explanation:
When a vehicle doesn't pass an emission test, the driver usually has a limited amount of time to get the problem fixed and emissions rechecked. The specific time frame can vary depending on the state or country where the test is being conducted. For example, in some states in the USA, if a vehicle fails an emission test, the driver is generally given 30 days to fix the problem and have the emissions rechecked. However, it's important to note that the exact time frame may differ, so it's always best to consult the specific guidelines and regulations of the relevant environmental agency or department.