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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 Desert Sun Automotive in Tucson

Discover more about Smog Check, Testing & Repair

Contact Us Today!

Got questions? We've got answers! Drop us a line, give us a call, or even stop by. Our team is eager to help you with any auto repair needs you have. Let's get you back on the road safely and swiftly!

What Our Customers Are Saying

I've used Desert Sun for over 20 years and been very happy. They are honest, do reliable work, priced fairly. They will not upsell you on something you don't need but will let you know about upcoming services you will need in the future so that you can plan. I don't hesitate to recommend Desert Sun to anyone.

Car & Truck Care, near Tucson, AZ

From out of town, everyone else was backed up for several days to several weeks. Dennis said he could fit me in if I could bring it over in the next hour. He got me all fixed up in one day, enabling me to head back home on schedule. An honest guy and a bona fide helpful person!

Car & Truck Care, near Tucson, AZ

Been bringing my car here for over 10 years. Excellent service at a fair price. Extremely trustworthy and, unlike the car dealerships, they don't try to sell you a bunch of services you don't really need.

Car & Truck Care, near Tucson, AZ

Honest mechanic. You want it done right - go here and they will be on the up and up every time. I have been coming here for years.

Car & Truck Care, near Tucson, AZ

, 01/14/2026

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