Arizona emissions testing stations are run by the state's Department of Environmental Quality, and you can find locations through their online station locator or by calling your county air quality office

Arizona requires emissions testing in Maricopa and Pima counties — the Phoenix and Tucson metro areas. If you live outside those counties, you do not need an emissions test to renew your registration. If you do live in a covered county, you must test your vehicle every two years, or every year if your vehicle is model year 1975 or older.

The state does not run the testing stations itself. Instead, it licenses private repair shops, service stations, and dedicated testing facilities to perform the test. You can search for a station near you on the Arizona Department of Environmental Quality website, or contact your county's air quality office directly for a list of current locations.

Key Takeaways

  • Emissions testing is required only in Maricopa County (Phoenix area) and Pima County (Tucson area); all other Arizona counties do not require it.
  • You can find licensed testing stations through the Arizona Department of Environmental Quality's online locator tool or by calling your county air quality office.
  • Testing stations are private businesses — repair shops, service stations, and dedicated test-only facilities — not government offices.
  • The test costs between $20 and $50 depending on the station, and you must pass before you can renew your vehicle registration.

How to find a testing station near you

The Arizona Department of Environmental Quality maintains a searchable database of licensed emissions testing stations on its website. You enter your county and city, and the tool shows you nearby stations with their addresses, phone numbers, and hours. This is the fastest way to find a location and confirm they are currently open.

If you prefer to call, contact your county air quality office directly. Maricopa County residents can reach the Maricopa County Air Quality Department, and Pima County residents can contact the Pima County Department of Environmental Quality. Both offices keep current lists of active stations and can tell you which ones have the shortest wait times.

What to bring and what to expect

Bring your vehicle registration and a valid photo ID. The test itself takes 10 to 15 minutes. The technician will connect your vehicle to a machine that reads your emissions data directly from your on-board diagnostic system — no tailpipe probe needed on most modern vehicles. You will receive a pass or fail result on the spot.

If you pass, the station will issue you a certificate or sticker (depending on the station's system) that you present when you renew your registration. If you fail, the station will give you a report showing which emissions standards your vehicle did not meet. You then have 30 days to repair the vehicle and retest at no additional charge at the same station.

Cost and payment methods

Testing fees range from $20 to $50 per test, depending on the station. Most stations accept cash, credit cards, and debit cards. Some stations charge slightly less if you pay cash. Call ahead if you want to confirm the exact price and payment methods before you arrive.

If your vehicle fails and you need repairs, the testing station can recommend repair shops, but you are not required to use their recommendation. You can take your vehicle to any repair shop you trust. Once repairs are complete, you can retest at any licensed station in your county — you do not have to return to the same one.

Timing and registration important date

Your emissions test is valid for two years from the date you pass (or one year if your vehicle is model year 1975 or older). You must have a current passing test before your vehicle registration expires. If your registration expires before you test, you cannot legally drive the vehicle until you test and pass.

Plan to test at least two weeks before your registration expires. This gives you time to retest if you fail the first time. If you wait until the last few days and fail, you may not have time to get repairs done and retest before your registration important date.

What happens if you fail the emissions test

A failure means your vehicle's emissions are above the state's limits for one or more pollutants. The test report will specify which standards you failed — typically nitrogen oxides, particulate matter, or hydrocarbons. This tells a repair shop where to focus their diagnosis.

Common reasons for failure include a faulty oxygen sensor, a malfunctioning catalytic converter, or a loose gas cap. Some repairs are inexpensive (under $100), while others can cost several hundred dollars. If repair costs exceed 150% of your vehicle's current market value, Arizona law allows you to request a waiver from the state, though the process and approval vary by county.

Testing stations in Maricopa County

Maricopa County (Phoenix metro area) has the largest number of testing stations in Arizona. You can find them in Phoenix, Tempe, Mesa, Scottsdale, Chandler, Gilbert, Glendale, Peoria, and other cities throughout the county. The Arizona Department of Environmental Quality website lists all active stations with current hours and phone numbers.

During peak times — the last two weeks of the month and the last two weeks before registration important date — wait times can stretch to an hour or more. Off-peak testing (early in the month, mid-week, and early morning) is usually faster. Some dedicated test-only facilities have shorter waits than full-service repair shops.

Testing stations in Pima County

Pima County (Tucson metro area) has fewer stations than Maricopa County but covers the Tucson area and surrounding communities. Testing locations are concentrated in Tucson itself, though some stations serve outlying areas. The Pima County Department of Environmental Quality website and phone line can direct you to the nearest station.

Pima County stations operate on the same schedule and fee structure as Maricopa County. The same timing information applies — test early in the month or mid-week to avoid long waits.

Frequently Asked Questions

Do I need an emissions test if I just moved to Arizona?

If you moved to Maricopa or Pima County, you must test your vehicle before you register it in Arizona. If you moved to a county outside those two, you do not need an emissions test. Your out-of-state registration is valid until it expires, but when you renew it in Arizona, you will need to test if you are in a covered county.

Can I test my vehicle before my registration expires?

Yes. You can test up to 90 days before your registration expires. The test certificate is valid for two years, so testing early gives you flexibility if you need repairs. However, if you test more than 90 days early, the certificate may expire before your registration does, and you will need to test again.

What if I cannot find a testing station with available appointments?

Most stations operate on a walk-in basis and do not take appointments. If you find long waits at one location, try another station in your county — different shops have different traffic patterns. Calling ahead to ask about current wait times can save you a trip. Early morning and mid-week visits typically have shorter waits than evenings and weekends.

Can I test a vehicle that is not registered to me?

You can test any vehicle you own or have permission to test, but you will need the vehicle's registration and your photo ID. If the vehicle is registered to someone else, bring written permission from the owner. The test certificate goes to whoever is registered as the vehicle's owner.

What if my vehicle has a check engine light on?

A check engine light does not automatically mean you will fail the emissions test. The test reads your vehicle's emissions data, not warning lights. However, the problem causing the check engine light may also cause an emissions failure. Have the problem diagnosed before testing if possible, or test first to see if you fail — the failure report will help a repair shop diagnose the issue.