Superior Auto Clinic
What is the Difference between Emissions Testing and a Smog Check?
Emissions Testing vs. Smog Check
State and local mandated emissions testing meets the EPA Tier 2 standard, while smog testing meets California's higher standard for EPA Tier 3.
How Do I Know If I Need a Smog Test?
Your DMV registration renewal notice will indicate "Smog Check Required" if your vehicle needs a smog check.
When Is a Smog Check Required?
- If you are selling a car or truck that is more than four years old
- When you register an out-of-state vehicle for the first time in California, you will need a smog check
- Every other year for vehicles that are more than six years old
When Is a Smog Check Not Required?
- 100% electric-powered vehicles do not need a smog check
- Motorcycles do not need a smog check
- Got a classic car? Vehicles that are model-year 1975 and older do not require a smog check
- Vehicles six model years and newer do not require a biennial Smog check
- Selling your car? Cars that are four model years and newer do not require a change-of-ownership Smog check
- Diesel-powered trucks that are model year 1997 and older
- Diesel-powered trucks with a gross vehicle weight rating of more than 14,000 pounds
Discover More About Exhaust Repair Services At Superior Auto Clinic in North Hollywood
Discover more about Smog Check, Testing & Repair
OUR REVIEWS
Marlan Clarke, 10/23/2025I’m so happy to be a client of this family owned business. I’ve been bringing my cars to Superior Auto for over 25 years. They are excellent at diagnostics. They take time to explain what is needed in a way I can understand and are patient answering all my questions They understood how much we rely on our cars so repairs are done in a timely manner. I know when I pick up my car I will drive out confident that my car is safe and road ready.
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