For instance, in California, a smog check is required when selling a used car that is more than four years old. However, a smog check may not be required for vehicles that are six or more model years old, such as those manufactured in the 1980s or earlier.
On the other hand, some states may not have any emission testing requirements at all, and selling a vehicle may not necessitate an emission test.
To determine the specific emission test requirements when selling a vehicle in your location, you can refer to your state's Department of Motor Vehicles (DMV) website or contact the DMV directly.
It's also important to note that if an emission test is required and the vehicle fails the test, the seller may be required to make repairs or provide evidence that the vehicle meets the emission standards before the vehicle can be sold.