What to Do If You Fail an Emissions Test in Arizona

Failing an emissions test in Arizona doesn’t mean your registration is doomed, but it does mean you’ll need to take prompt action. The Arizona Department of Environmental Quality (ADEQ) mandates vehicle emissions testing in certain areas to help maintain clean air standards. If your car or truck doesn't pass, you’ll need to follow specific steps to get back on the road legally.

Understand Why Your Vehicle Failed

Your emissions test results will include a detailed report indicating the reason for the failure. Common issues include:

Malfunctioning oxygen sensors
Catalytic converter problems
Evaporative emissions system leaks
Check Engine Light codes (OBD-II failures)

This report is crucial for mechanics to diagnose and fix the problem effectively.

Make the Necessary Repairs

After reviewing the emissions test results, take your vehicle to a certified repair technician. While you're not required to use a specific shop, consider choosing a Recognized Repair Facility certified by ADEQ, as they specialize in emissions-related repairs.

Keep all receipts and documentation of work performed. These will be necessary if you apply for a waiver or need to show proof of repair.

Retesting Requirements

Once repairs are complete, you must return for a retest. There is no additional fee for one retest if you return within 60 days of the original test. After 60 days, you’ll have to pay the full testing fee again.

Bring the following with you to the retest:

The original failed test results
Receipts for emissions-related repairs
Vehicle registration and identification

Emissions Test Waivers

In some cases, you may qualify for a waiver if repairs are unsuccessful but you’ve met specific expenditure requirements. For example:

For 1981 and newer vehicles: You must spend at least $450 on emissions-related repairs.
For 1980 and older vehicles: The requirement is $200.

These costs must be for actual emissions-related components, not general maintenance.

To apply for a waiver, visit an ADEQ Waiver Facility and present:

The failed test report
Repair receipts
Diagnostic and repair documentation

More information is available on the ADEQ Vehicle Emissions Testing Program page.

Registration Deadlines and Extensions

You cannot renew your vehicle registration until it passes emissions or qualifies for a waiver. If your registration is close to expiring and you need more time, you can request a 30-day extension through the MVD website.

Driving with an expired registration or without emissions compliance may lead to fines or vehicle impoundment.

Emissions Test Locations and Hours

Emissions testing is required primarily in:

Maricopa County (Phoenix area)
Pima County (Tucson area)

You can find the nearest testing locations and current wait times through the ADEQ Testing Locations Directory.

Tips for Passing Next Time

To avoid another failure, consider these proactive steps:

Ensure the "Check Engine" light is off and codes are cleared
Get an oil change if it’s due
Replace air filters and spark plugs if worn
Drive your car for at least 15 minutes before testing to reach proper engine temperature

Failing an emissions test isn’t the end of the road. Arizona provides a structured path for repairs, retesting, and even waivers if necessary. Stay proactive, keep your documentation organized, and use official channels like ADEQ and the MVD to navigate the process effectively.