Gasoline-powered vehicles, hybrid vehicles, and alternative-fuel vehicles that are model year 1976 and newer require a smog test, with the following exceptions:
Eight model-years and newer do not need a biennial (every other year) inspection.
Four model-years and newer do not need a change-of-ownership inspection.
To determine the first year a vehicle is subject to a biennial or change-of-ownership Smog Check, add eight or four, respectively, smog test to the model year of a vehicle. For example, a 2010 model-year vehicle will first be subject to a biennial Smog Check in 2018 (2010 + 8 = 2018) and a change-of-ownership Smog Check in 2014 (2010 + 4 = 2014).
Diesel-powered vehicles 1998 and newer with a gross vehicle weight rating of 14,000 pounds and less require a Smog Check.