Arizona emissions testing happens at certified stations, not at the DMV or a single state office

Arizona does not run a centralized emissions testing program. Instead, the state licenses private testing stations — repair shops, tire dealers, and dedicated emissions facilities — to perform the test. You choose which station to visit, and you pay them directly. The test itself costs between $20 and $50 depending on the station and your vehicle type.

The state's Department of Environmental Quality (ADEQ) oversees which stations can test, but ADEQ does not test vehicles itself. You will not find a state office where you can walk in for an emissions test. Instead, you search for a certified station near you, call ahead to confirm they test your vehicle model year, and schedule an appointment or walk in during their testing hours.

Key Takeaways

  • Arizona emissions tests are performed at private certified stations, not at government offices, and you pay the station directly.
  • You can find certified stations through the ADEQ website or by searching online for "emissions testing near me" in your county.
  • The test costs $20 to $50 and takes 15 to 30 minutes; some stations offer same-day results while others mail results within a few days.
  • Not all Arizona counties require emissions testing — only Maricopa, Pima, and Pinal counties have mandatory testing programs.
  • If your vehicle fails, you have 60 days to repair it and retest at any certified station before your registration renewal is denied.

Which Arizona counties require emissions testing

Only three Arizona counties have mandatory emissions testing: Maricopa (Phoenix area), Pima (Tucson area), and Pinal (between Phoenix and Tucson). If you live in any other county, you do not need an emissions test to renew your vehicle registration, even if your vehicle is old enough to require testing in other states.

Maricopa County has the largest testing network because it covers the Phoenix metropolitan area and has the most vehicles. Pima County's program covers Tucson and surrounding areas. Pinal County's program is smaller but follows the same rules. If you live in one of these three counties and your vehicle is model year 2000 or newer (for gasoline vehicles) or 2001 or newer (for diesel), you must pass an emissions test before you can renew your registration.

How to find a certified emissions testing station

The Arizona Department of Environmental Quality maintains a searchable list of certified stations on its website at azdeq.gov. You can search by county and city to find stations near your home or workplace. The list includes the station's name, address, phone number, and hours of operation. Some stations specialize in emissions testing; others are full-service repair shops that offer testing as one service among many.

You can also search online for "emissions testing" or "smog check" plus your city name. Many stations advertise their testing services on Google Maps and their own websites, which often show customer reviews and wait times. Call ahead before you go — not all stations test all vehicle types, and some may have a wait or require an appointment during busy seasons.

What to bring and what to expect during the test

Bring your vehicle registration and proof of insurance. The station will need to know your vehicle's year, make, model, and engine size to run the correct test protocol. Your vehicle's odometer reading will be recorded. The test itself takes 15 to 30 minutes and involves connecting your vehicle to a machine that measures tailpipe emissions while the engine runs through a standardized cycle.

You do not need to stay in the vehicle during the test, but you should stay at the station. Some stations will give you results on the spot; others mail results within a few days or email them to you. You will receive a pass or fail result and, if you fail, a report showing which emissions standards your vehicle did not meet. Keep this report — you will need it if you take your vehicle to a repair shop to fix the problem.

What happens if your vehicle fails the emissions test

A failed test does not mean your registration is automatically denied. Instead, you have 60 days from the test date to repair your vehicle and retest at any certified station in your county. You do not have to return to the same station. Once you pass the retest, you can renew your registration with the passing result.

If you do not retest within 60 days, your registration renewal will be denied until you pass an emissions test. Some common repairs that help vehicles pass include replacing a faulty oxygen sensor, fixing a loose gas cap, or addressing a check engine light. If repairs are expensive, you can get a second opinion from another repair shop before committing to work. The emissions test report will tell you what failed, which helps a mechanic diagnose the problem faster.

Emissions testing costs and payment methods

The test itself costs between $20 and $50 at certified stations. The exact price varies by station and by vehicle type — diesel vehicles sometimes cost more to test than gasoline vehicles. Some stations charge a flat rate; others charge based on your vehicle's model year or engine size. Call ahead to ask the price before you arrive.

Most stations accept cash, debit cards, and credit cards. Some accept online payment or payment through their website. If you fail and need to retest, you will pay the testing fee again at the retest station. The cost of repairs to fix emissions problems is separate from the testing fee and depends entirely on what is wrong with your vehicle.

Retesting after repairs and registration renewal

After you repair your vehicle, you can retest at any certified station in your county — you do not have to return to the station where you failed. Bring your failed test report with you so the technician knows what was tested before. The retest follows the same procedure and costs the same as the initial test. Once you pass, the station will provide you with a passing result that you can use to renew your registration.

You can renew your registration online through the Arizona Department of Transportation (ADOT) website, by mail, or in person at an ADOT office or authorized third-party location. You will need your passing emissions test result, your vehicle registration, proof of insurance, and payment for the registration renewal fee. The emissions test result is valid for 60 days from the test date, so plan your retest and registration renewal accordingly.

Frequently Asked Questions

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

No. You must test in the county where your vehicle is registered. If you move to a different county in Arizona, you can transfer your registration to the new county, but you must test in that county if it requires testing. If you move to a county that does not require testing, you will not need to test anymore.

What if I just bought a used vehicle and it failed emissions at the dealer?

A dealer's test result is not official for registration purposes. You must take your vehicle to a certified station and pass their test to renew your registration. If the vehicle failed at a dealer, take the report to a repair shop to understand what needs to be fixed before you retest at a certified station.

Do I need an emissions test if my vehicle is older than the required model year?

No. In Maricopa, Pima, and Pinal counties, only vehicles model year 2000 or newer (gasoline) or 2001 or newer (diesel) must test. Older vehicles are exempt from testing. If your vehicle is older than these years, you do not need an emissions test to renew your registration in those counties.

How long does it take to get my emissions test results?

Some stations provide results when ready on the day of the test. Others mail results or email them within a few days. Ask the station when you call or arrive whether they offer same-day results. If you need results quickly to renew your registration before a important date, choose a station that provides same-day results.

What if my vehicle has a check engine light on?

Many stations will still test your vehicle with a check engine light on, but your vehicle will likely fail because the light indicates an emissions-related problem. Have the light diagnosed by a repair shop first, fix the problem, and then test. Some stations can read your vehicle's diagnostic codes to help you understand what triggered the light.