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Utah County emissions testing rules for 2026

What Utah County requires before you can renew your registration, which vehicles are exempt, what a test costs, and who to call.

Which model years need a test in 2026

Utah County is the only one of the five counties whose DMV table also lists diesel model years 1998 to 2021 as required. Diesel vehicles 2022 and newer, 1997 and older, and those over 14,001 lbs GVWR are exempt. (Source: Utah Division of Motor Vehicles; Utah County Bureau of Air Quality)

Exempt vehicles

• New vehicles with an MSO
• Electric vehicles
• Motorcycles
• Off-highway and farm vehicles
• Vehicles with an engine of 650cc or less, or a 2-cycle engine
• Custom vehicles
• Diesel vehicles 1997 and older, 2022 and newer, or over 14,001 lbs GVWR

Exemptions as listed by the Utah DMV and the county. (Source: Utah Division of Motor Vehicles; Utah County Bureau of Air Quality)

What a test costs

There is no set fee in Utah County. Certified I/M stations set their own price but must post it, and since January 1, 2026 a station may charge only one emissions price for all vehicles, including diesels. The county lists nearly 200 certified stations, recognizable by blue and white signs. (Source: Utah County Bureau of Air Quality; Utah County Bureau of Air Quality; Utah County Health Department)

The county says three major emission components (catalytic converter, powertrain control module, and the OBD system on 1996 and newer vehicles) are covered by the federal emissions warranty for 8 years or 80,000 miles. If a newer car fails, ask the dealer about warranty coverage first. (Source: Utah County Bureau of Air Quality)

Cities in Utah County

Provo, Orem, Lehi, American Fork, Spanish Fork, Pleasant Grove, Saratoga Springs, Eagle Mountain, Springville, Lindon.

What to do if you fail · How the test ties to registration

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