What Utah requires and who has to test

Utah requires emissions testing for most vehicles registered in the state, but the rules depend on where you live and what year your vehicle was made. If you live in Salt Lake, Davis, Weber, or Utah County — the areas around Salt Lake City — you must test every two years. If you live anywhere else in Utah, you do not need to test at all. Vehicles from 1967 and earlier, diesel trucks, and motorcycles are exempt statewide.

Your vehicle must pass an OBD test (on-board diagnostic test), which means the testing station plugs a scanner into your car's computer port to check emissions systems. This is not a tailpipe test. The test takes about five minutes and costs between $15 and $25 depending on the testing station.

You can test any time during your two-year window, but you cannot test more than 120 days before your registration expires. If your registration expires in June, you can test starting in February. Testing after your registration expires means you are driving illegally and cannot renew your registration until you pass.

Key Takeaways

  • Only residents of Salt Lake, Davis, Weber, and Utah counties must test; the rest of Utah has no emissions requirement.
  • Testing is required every two years and must happen within 120 days before your registration expires.
  • The test plugs into your vehicle's computer port and takes about five minutes; it costs $15 to $25.
  • Vehicles from 1967 and earlier, diesel trucks, and motorcycles do not need to test anywhere in Utah.
  • You cannot renew your registration without a passing test result if you live in a testing county.

How to find a testing station near you

Utah's Division of Air Quality maintains a list of all authorized testing stations on their website. You can search by county or city to find stations near your home or work. Most testing stations are independent repair shops, not dealerships, and many are open early and late to fit around work schedules.

Call ahead before you go. Some stations fill up during rush hours or have equipment down for maintenance. A quick phone call confirms they are open and can test your vehicle type — most test all passenger cars and light trucks, but a few have restrictions on certain makes or model years.

Bring your vehicle registration and a photo ID. The testing station will need your vehicle identification number (VIN), which is on your registration and on the dashboard at the base of the windshield on the driver's side. You do not need to make an appointment at most stations, but calling first saves a wasted trip.

What happens if your vehicle fails the test

If your vehicle fails, the testing station gives you a written report showing which emissions systems did not pass. Common failures are a faulty oxygen sensor, a loose gas cap, or a problem with the catalytic converter. The report tells you what needs repair, not how to repair it.

You have until your registration expires to fix the problem and retest. Retesting costs the same as the first test. Once you pass, the testing station sends your result electronically to the Division of Motor Vehicles, and you can renew your registration online or in person.

If you cannot afford the repair, Utah offers a waiver program. If you spend $375 or more on repairs and still fail, you can request a waiver from the testing station. The station submits the waiver request with your repair receipts, and the Division of Air Quality decides whether to grant it. A waiver lets you renew your registration even with a failed test, but you must show proof of the repair attempt.

Timing your test before registration renewal

Your registration renewal notice arrives in the mail about 30 days before your registration expires. The notice shows your expiration date and tells you whether you need to test. Do not wait until the last week — testing stations get busy, and if you fail and need repairs, you will not have time to fix the vehicle and retest.

Plan to test at least four weeks before your registration expires. This gives you time to get repairs done if you fail, retest, and then renew your registration without rushing. If your registration expires on June 30, test by early June at the latest.

You can renew your registration online through the Division of Motor Vehicles website, by mail, or in person at a county clerk's office. You will need your test result number, which the testing station gives you when ready after you pass. Online renewal is fastest — you can complete it in minutes once you have your passing test result.

What to do if you move or buy a used vehicle

If you move into a testing county from outside Utah or from a non-testing county, you must test before you can register your vehicle in the new county. If you move out of a testing county, you no longer need to test, even if your current registration still shows the old county.

When you buy a used vehicle, the seller's test result does not transfer to you. You must get your own test in your name and county. If the vehicle is new to you and you are registering it for the first time in Utah, you have until your first registration expires to test — usually two years from the purchase date.

Vehicles that do not need to test

Diesel trucks, motorcycles, and any vehicle made in 1967 or earlier never need to test in Utah, even if you live in a testing county. Hybrid vehicles and electric vehicles also do not test — they are exempt because they produce zero tailpipe emissions.

If you own a vehicle that is exempt, you still need to register it normally. The exemption only removes the testing requirement; it does not change registration fees or renewal timing.

Frequently Asked Questions

Can I test in a different county than where I live?

Yes. You can test at any authorized station in Utah, even if it is in a different county. The test result is valid for registration renewal in your home county as long as you live in a testing area.

What if I fail the test and cannot afford to fix my vehicle?

Utah's waiver program lets you renew your registration if you spend $375 or more on repair attempts and still fail. You must show the testing station your repair receipts, and they submit the waiver request to the Division of Air Quality for approval.

Do I need to test if I just bought a vehicle from out of state?

If you are registering it in a testing county, yes. You must test before or during your first registration renewal. If you are registering it in a non-testing county, you do not need to test at all.

What if the testing station says my vehicle cannot be tested?

Call the Division of Air Quality directly. If a station refuses to test your vehicle, they must document the reason. The Division can tell you whether your vehicle is actually exempt or whether the station made an error.

Can I renew my registration before I test?

No. If you live in a testing county, your registration will not renew without a passing test result. The system blocks renewal until the test is submitted electronically to the Division of Motor Vehicles.