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
Veto Swarn, 10/30/2025The guy that worked on my 88 Suburban did a PHENOMENAL job. Fixed coolant, and power steering leaks(hoses, etc), pump, and heater core, kept me posted on the process and notified me before doing ANYTHING additionally. I have been looking for a mechanic I can trust with my 88, which is my daily driver. Barely anyone has the knowledge, and I can only do so much as I have to do my work on the side of the street. I will definitely be coming back. Amazing work. I will have to find out the guys name, older out of the mechanics. Found my shop i can trust
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