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.

Your DMV registration renewal notice will indicate "Smog Check Required" if your vehicle needs a smog check.

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

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

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