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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 L&D Auto Specialists in Olathe

Emissions And Smog Testing
Discover more about Smog Check, Testing & Repair
Inspections & Emissions

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

Great mechanic I've been going to him for years. Keeps all our cars running great. They got great customer service and great pricing

, 01/13/2026

Great guys, highly recommended shop, friendly and awesome customer service even gave me a ride back to work!

, 09/29/2025

My vehicle was having some mysterious interior water leaking issues when it would rain. I took it in and worked with Jose, Angel, and Hector, each of them are incredibly knowledgeable and professional. They diagnosed the problem pretty quickly, explained everything to me clearly, and handled the repair in a really reasonable time frame. You can tell they know what they're doing and take pride in their work. Finding a shop that's both skilled and honest hasn't been easy for me personally, but these guys for sure exceeded my expectations of quality work! Recommend!

Olathe, KS

, 06/02/2025

Top tier service! Always takes great care of us!

Olathe, KS

, 05/06/2025

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