If you own a vehicle in Arizona, emissions testing is crucial to keeping your car road-legal and environmentally friendly. Failing to pass the test can delay registration and result in costly repairs. Here’s everything you need to know before your next emissions check.
Who Needs an Emissions Test?
Not all vehicles in Arizona require emissions testing. Generally, vehicles registered in Phoenix and Tucson metropolitan areas must undergo regular testing. The following vehicles are exempt:
- New vehicles from the last five model years
- Electric and alternative fuel vehicles
- Motorcycles
- Vehicles that were made in 1966 or older
- A vehicle that resides outside of Tucson and Phoenix in an area that does not require emissions testing
- You are military, stationed out of the state, and the vehicle is not in use
- Your vehicle is in an area of a state that does not require emissions testing, and you apply for an out-of-state exemption
If you’re unsure whether your vehicle needs testing, check with the Arizona Department of Environmental Quality (ADEQ).
How Often is Testing Required?
The frequency of emissions testing depends on the age and type of your vehicle:
- Vehicles older than 5 years but newer than 1996 – every two years
- Vehicles older than 1996 – every year
- Heavy-duty diesel vehicles – every year
What to Expect During the Test
Arizona uses four types of testing depending on the age and fuel your vehicle uses: IM 147, steady-state loaded/idle, OBD (onboard diagnostics), and diesel. When you bring your car to an emissions testing facility, the process typically involves:
- Visual Inspection – The technician checks for tampering with emissions-related components.
- Onboard Diagnostics (OBD-II) Scan – Most vehicles from 1996 and newer will have their OBD system checked for emissions-related errors.
- Tailpipe Test – Older vehicles (pre-1996) undergo a tailpipe test while running on a dynamometer.
- Gas Cap Test – Ensures the gas cap is properly sealed to prevent fuel vapor leaks.
How to Prepare for Your Emissions Test
To increase the likelihood of passing your emissions test, follow these tips:
- Warm up your engine: Drive for at least 15-20 minutes before the test to ensure the catalytic converter is fully functional.
- Fix check engine lights: If your check engine light is on, your car will fail the test. Have a mechanic diagnose and repair the issue beforehand.
- Fill your tank: You should test with at least ½ a tank of fresh fuel.
- Get an oil change: Dirty oil can increase emissions readings.
- Check your gas cap: A loose or faulty gas cap can cause a failure.
- Ensure proper tire pressure: Properly inflated tires help maintain accurate testing results.
- Use quality fuel: Higher-quality gasoline and fuel additives can help clean the engine and improve emissions performance.
What Happens If You Fail?
If your vehicle doesn’t pass, you’ll receive a report detailing the reason for failure. You may be required to make necessary repairs and retest. Some important things to note:
- You do not need to pay for the test again if you return within 60 days.
- Arizona offers The Voluntary Vehicle Repair Program (VVRP) that pays up to $900 toward the cost of emissions-related vehicle repairs after a failed emissions test. Participants must meet program requirements and pay a $100 co-pay toward repairs.
- Free retests are available at some testing centers if the necessary repairs have been made.
Where to Get a Test in Arizona
Emissions testing facilities are conveniently located across the Phoenix and Tucson metro areas. You can find your nearest location by visiting the ADEQ website or calling their customer service line.
Arizona’s emissions testing helps reduce air pollution and keeps vehicles running efficiently. Preparing in advance and maintaining your vehicle can save you time, money, and hassle. If you have concerns about passing, give us a call. We can ensure your car is in top shape before heading to the emissions station.
By following these guidelines, you can keep your vehicle compliant and avoid any unnecessary delays in registration. Safe driving!
