Smog Check in American Fork, UT. Vehicle emissions check is a procedure mandated by the government to ensure that it complies with regulations governing emissions. Inspection can be required yearly on most vehicles or on transfer of title. Most vehicles require an inspection before registration renewal. Here at Emissions of American Fork, we offer emissions testing and On the Spot Renewal. Our station that is authorized to examine vehicles with different fuel types. Since the only services we offer are emissions testing and vehicle renewals it only takes about 10 minutes for most vehicles. No appointments, just walk in and bring an old registration or a copy of the title if possible.