We often get the question if a vehicle needs an emissions test. The following seven counties require emission test: Kenosha, Milwaukee, Ozaukee, Racine, Sheboygan, Washington, and Waukesha. A test is required for vehicles with auto or light truck plates. Vehicles between the years of 1996 and 2006 with a gross vehicle weight rating less than 8,501 pounds. Vehicles 2007 and newer with a gross vehicle weight rating up to 14,000 pounds. Odd year vehicles are tested in even years and even year vehicles are tested in the odd years. A test could be required for the following: when a vehicle is purchased, when an owner is added or removed from a vehicle title, new residents transferring vehicle to Wisconsin. Vehicles 3 years or older will require an emission test as well. The test themselves are free of charge and take about 10 minutes. There is no appointment necessary; first come first serve.