Smog tests are not done at DMV offices — you need a separate, certified station

The DMV does not perform smog tests. California, Connecticut, Delaware, New York, and a few other states require a smog test (also called an emissions test or inspection) before you can renew your vehicle registration, but you must go to a private certified station to get it done. The DMV will only accept the test results once you bring them in or submit them electronically.

Finding a station near your DMV office is straightforward because most states publish searchable lists of certified testers online. The test itself takes 10 to 30 minutes and costs between $30 and $80 depending on your state and vehicle type. You cannot renew your registration without passing the test first — the DMV will reject your renewal process if the results are missing or failed.

Key Takeaways

  • Smog tests must be done at a private certified station, not at the DMV, and you need the results before you can renew your registration.
  • California, Connecticut, Delaware, New York, and several other states require smog tests; check your state's DMV website to confirm whether your vehicle needs one.
  • Each state publishes a searchable list of certified test stations on its DMV or environmental agency website, usually filterable by ZIP code or city.
  • Bring your vehicle registration, proof of insurance, and a valid ID to the test station; the test takes 10 to 30 minutes and costs $30 to $80.
  • If your vehicle fails, you have a set number of days (usually 30 to 60) to repair it and retest at no additional charge at the same station.

How to find certified smog test stations in your state

Each state that requires smog testing maintains an official list of certified stations. In California, use the Bureau of Automotive Repair's online station locator at bar.ca.gov — enter your ZIP code and it shows all stations within a set radius, their hours, and whether they accept walk-ins. Connecticut's Department of Energy and Environmental Protection (DEEP) provides a similar list at ct.gov/deep. New York's Department of Environmental Conservation (DEC) lists stations by county at dec.ny.gov.

If you are renewing your registration near your DMV office location, search for stations in that ZIP code rather than your home address. Many stations cluster near DMV offices because people often need both services in the same trip. Call ahead to confirm hours and whether the station accepts walk-ins — some require appointments, especially during peak renewal seasons (typically August through October).

Do not assume a repair shop or gas station does smog testing just because it services vehicles. Only stations with a state certification number can perform the test, and the DMV will reject results from uncertified testers. The official state list always shows which stations are currently certified.

What to bring and what to expect during the test

Bring your vehicle registration, proof of insurance, and a valid photo ID. The tester will run your vehicle's identification number (VIN) through the state system to confirm it is registered and may be able to access for testing. Have your keys ready — the tester will need to start the engine and may drive the vehicle onto a dynamometer (a machine that measures emissions under load) or use a tailpipe probe for a static test.

The test itself takes 10 to 30 minutes. You will usually wait in the station while it runs. The tester will print your results on the spot — either a pass certificate or a fail notice with the specific emissions that exceeded limits. If you pass, you receive a certificate with a reference number that you can take to the DMV or submit online when you renew your registration. If you fail, the certificate will list what needs repair.

Keep your test results safe. Many states now allow you to submit results electronically to the DMV, but some still require you to bring the physical certificate. Check your state's DMV website to see whether you can upload results online or must present them in person.

What happens if your vehicle fails the smog test

A failed test does not mean you cannot renew your registration — it means you must repair the vehicle and retest before the DMV will accept your renewal. Most states give you 30 to 60 days from the test date to fix the problem and return to the same station for a retest at no additional charge. The station will note your original test in the system so you do not pay twice.

Common reasons for failure include a faulty oxygen sensor, a loose gas cap, a malfunctioning catalytic converter, or an engine light that is on. A repair shop can diagnose the issue, but you do not have to use the testing station's recommended shop — you can take your vehicle anywhere. Once repaired, return to any certified station (not necessarily the same one) for the retest.

If you cannot afford the repair when ready, contact your state's DMV about a waiver or extension. Some states offer repair information programs or temporary registration extensions for low-income vehicle owners. California's Smog Check Referee Program, for example, can override a failed test if the repair cost exceeds a certain threshold. Check your state's DMV website for these options.

States that require smog tests and where to find the official list

Not all states require smog testing. The states with active smog test programs are California, Connecticut, Delaware, Maine, Maryland, Massachusetts, Missouri, Nevada, New Jersey, New Mexico, New York, Oregon, Pennsylvania, Rhode Island, Texas, Utah, Vermont, Virginia, and Washington. Some states only test vehicles in certain counties or only for certain model years. Your state's DMV website will tell you whether your vehicle needs a test before renewal.

To find the official station locator for your state, go to your state's DMV website and search for "smog test stations," "emissions test," or "inspection stations." The link is usually under vehicle registration or inspection requirements. Bookmark it — you will need it again when your registration renews next year.

How smog test results connect to your DMV registration renewal

Once you have a passing smog test result, you can renew your registration. In most states, you can submit the test results online through the DMV portal, by mail, or in person at a DMV office. If you submit online, the DMV typically processes your renewal within a few business days. If you bring the certificate in person, renewal is usually when ready.

If you fail the test and do not retest before your registration expires, the DMV will reject your renewal process. You cannot legally drive the vehicle on public roads with an expired registration, even if you are waiting for repair results. Plan ahead — take the smog test at least 30 days before your registration expires so you have time to repair and retest if needed.

Some states now allow you to renew your registration online without visiting a DMV office at all, as long as you submit your smog test results electronically. Check whether your state offers this option on its DMV website.

Common mistakes to avoid when getting a smog test

Waiting until the last day of your registration expiration. If you fail, you will not have time to repair and retest. Test at least 60 days before expiration.

Going to an uncertified station. The DMV will not accept results from a shop that is not on the official state list. Always verify the station's certification number before you go.

Forgetting to bring your registration and ID. The tester needs these to run your VIN and confirm you are the registered owner. You cannot test without them.

Not keeping your test results. Even if you submit them online, keep a copy for your records. The DMV may ask for proof later if there is a dispute about your renewal status.

Assuming your repair shop will handle the retest. Some repair shops have in-house testers, but many do not. After repair, you still need to go to a certified station to get the official retest result.

Frequently Asked Questions

Can I get a smog test at the same time as my DMV appointment?

No — you must complete the smog test before you go to the DMV. The test is done at a separate certified station, and you need the passing results to bring with you or submit online. Plan to visit the test station first, then the DMV once you have your certificate.

What if I just moved and my vehicle is registered in a different state?

You must follow the smog test rules of the state where your vehicle is currently registered, not where you live now. If you are moving to a state that requires smog testing, you will need to get a test before you can register your vehicle there. Check the new state's DMV website for its specific requirements.

Do I need a smog test if my vehicle is brand new?

Most states exempt new vehicles from smog testing for the first few years (usually 2 to 4 years, depending on the state). Check your state's DMV website or call the test station to confirm whether your vehicle is exempt based on its model year.

How long is a smog test result valid?

A passing smog test result is typically valid for 30 days from the test date. You must submit it to the DMV or renew your registration within that window. If the 30 days pass, you will need a new test.

What if the test station gives me conflicting information about my vehicle's requirements?

Call your state's DMV directly or check the official DMV website to confirm whether your vehicle needs a smog test. The DMV can tell you based on your VIN, vehicle type, and registration status. Do not rely only on what a test station tells you, as they may have outdated information.