Arizona requires emissions testing in the Phoenix metro (Area A) and Tucson area (Area B). Frequency depends on vehicle age and area. The Arizona Department of Environmental Quality (ADEQ) runs the program through state-operated test centers.
Rules change. Verify the current Arizona requirements with the state DMV or environmental agency before you go. This guide reflects the program as of 2026.
| Item | What the Inspector Checks |
|---|---|
| OBD-II scan (1996+) | Phoenix Area A on most newer gas vehicles. Tucson Area B too. |
| Loaded dynamometer (older) | 1981-1995 vehicles in Area A get a loaded dyno test - more rigorous than idle. |
| Idle tailpipe test | 1967-1980 vehicles get an idle tailpipe test in both areas. |
| Evaporative test | Most vehicles tested for fuel system integrity. |
| Visual smoke check | Excessive smoke = fail. |
| No safety inspection | Arizona does not check brakes, tires, lights, or other safety items. |
Active check engine light is one of the top reasons cars fail in this state.
Get a Full Diagnosis →Readiness monitors not ready is one of the top reasons cars fail in this state.
Get a Full Diagnosis →Catalytic converter failure is one of the top reasons cars fail in this state.
Get a Full Diagnosis →Failed evap or gas cap is one of the top reasons cars fail in this state.
Get a Full Diagnosis →Heat-degraded O2 sensor is one of the top reasons cars fail in this state.
Get a Full Diagnosis →Excessive smoke is one of the top reasons cars fail in this state.
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Area A: Phoenix metropolitan area (Maricopa County and parts of Pinal). Area B: Tucson metropolitan area (Pima County).
OBD-II only is $13. Loaded dyno test is $19. Heavy-duty diesel is up to $24.
Phoenix Area A: annual for vehicles 6 model years and older. Tucson Area B: biennial for vehicles 5 model years and older.
You can retest one time at no charge within 60 days at the same test center.
Yes. Drivers who have spent at least $200 on documented emissions repairs and still fail may qualify for a one-time waiver.
No. Arizona has never had an annual safety inspection program for personal vehicles.