T he Smog Check program divides the state into three different types of areas depending on the severity of the smog problem in that area. All areas of California require Smog Check inspections when a vehicle changes ownership or is registered for the first time in California.
Most areas also require testing every two years, at the time of registration renewal.
Biennial Smog Checks are required here. Technician License allows an individual to inspect, diagnose, adjust, repair, and certify the emissions control systems of vehicles registered in the state's Basic and Change of Ownership Areas. Technician License may be used statewide until it expires, and must then be replaced with either an EA or EB license. The Intern Technician license may be used statewide, but it is nonrenewable and expires after two years. This license does not allow the licensee to perform Smog Check inspections.