Contact Fullerton Smog and Test Only for the best in smog checks. We offer 15-minute smog checks, which are mandatory every 2 years and when you're changing title. Wheter its a brand new car or not it is mandatory for out-of-state vehicles to get their car smogged (California Regulations). It is best when you are also selling your vehicle to get it tested so you have no problems with the buyer. Smog check is also mandatory for government fleet vehicles, kit cars, and gray market vehicles. For more information today. Our auto center proudly serves Orange County.