What Happens During an Emissions Test in Arizona?
In Arizona, emissions testing plays a critical role in reducing air pollution and maintaining compliance with federal and state environmental standards. The Arizona Department of Environmental Quality (ADEQ) oversees the Vehicle Emissions Inspection Program, which is mandatory for certain vehicles registered in the Phoenix and Tucson metropolitan areas.
Emissions Test Requirements
Arizona requires emissions testing for most gasoline-powered vehicles model year 1967 and newer, and most diesel-powered vehicles with a gross vehicle weight rating (GVWR) of 8,500 pounds or less. Exemptions apply to:
- Vehicles within the first five model years (some exceptions apply)
- Electric vehicles
- Motorcycles (in Tucson only)
- Collectible vehicles meeting specific criteria
You can check if your vehicle is due for testing via the ADEQ Emissions Test Portal.
What to Expect During the Test
When you arrive at a certified emissions testing station, the process typically includes:
1. Vehicle Inspection
An inspector will perform a visual check of your vehicle’s gas cap, emissions control equipment, and onboard diagnostics (OBD) system (for 1996 and newer vehicles). This includes verifying that the check engine light is off and that all required monitors are set.
2. Emissions Measurement
Depending on your vehicle’s age and fuel type, one or more of the following tests may be performed:
- On-Board Diagnostics (OBD) Scan: For vehicles model year 1996 and newer, this scan checks if emissions-related systems are working correctly.
- Idle Test: Older vehicles may be tested for tailpipe emissions while idling.
- Loaded/IM240 Test: A treadmill-style test for certain vehicles where emissions are measured during simulated driving conditions.
3. Results and Certificate
If your vehicle passes, you will receive a certificate valid for registration renewal. ADEQ will also electronically update your test results with the Arizona MVD. If your vehicle fails, the inspector will provide a report detailing the reason, and you must repair and retest the vehicle before registration.
Cost and Locations
Emissions testing fees generally range from $12.25 to $25, depending on vehicle type and test required. Payments can be made by cash, credit card, or check.
You can find testing station locations and wait times through the MyAZCar.com station locator.
Tips for a Successful Test
- Ensure your check engine light is off before testing.
- Drive your vehicle for at least 15 minutes prior to testing to warm up the engine.
- Avoid testing immediately after disconnecting the battery or completing major repairs.
- Complete any necessary maintenance or repairs before the test.
Failing the Test: Next Steps
If your vehicle fails, Arizona offers a Repair Assistance Program to help eligible motorists with the cost of repairs. This includes income-based assistance and a waiver process if you meet specific requirements after repair attempts.
More information on repair assistance can be found on the ADEQ official site.
Related Resources
For more information to help you stay road-legal in Arizona, check out these guides:
Staying informed about emissions regulations ensures both compliance and cleaner air for all Arizonans.