Indiana requires emissions testing in only one county, and you can complete it at any certified inspection station

Indiana has one of the least restrictive emissions testing programs in the country. Only Marion County — which includes Indianapolis — requires emissions testing. If you live anywhere else in Indiana, you do not need an emissions test to register your vehicle, no matter the age or type.

In Marion County, you must pass an emissions test before you can renew your vehicle registration. The test measures tailpipe emissions to may support your vehicle meets federal Clean Air Act standards. You can take the test at any station certified by the Indiana Department of Environmental Management (IDEM), and the test itself takes about 10 minutes.

The test costs between $15 and $25 depending on the station. You pay the station directly — there is no state fee separate from what the inspection station charges. Once you pass, the station sends your results electronically to the Bureau of Motor Vehicles, and you can proceed with registration renewal.

Key Takeaways

  • Only Marion County residents must pass an emissions test; the rest of Indiana has no emissions testing requirement.
  • The test measures what comes out of your tailpipe and takes about 10 minutes at any IDEM-certified station.
  • You can find certified stations through the IDEM website or by calling your local BMV branch.
  • If your vehicle fails, you have 30 days to repair it and retest at no additional charge at the same station.
  • Vehicles older than 1968 and some diesel trucks are exempt from testing even in Marion County.

Which vehicles are exempt from Marion County testing

Not every vehicle in Marion County needs to be tested. Vehicles manufactured before 1968 are exempt, as are motorcycles and mopeds. Diesel-powered vehicles are also exempt unless they were originally designed to run on gasoline.

Electric vehicles do not require testing. Vehicles registered as historic or antique — which typically means they are driven fewer than 5,000 miles per year and are at least 25 years old — are exempt as well. If your vehicle falls into one of these categories, you can renew your registration without an emissions test.

How to find a certified emissions testing station

The Indiana Department of Environmental Management maintains a searchable list of all certified inspection stations on its website. You can search by county and city to find stations near you. The list includes the station's address, phone number, and hours of operation.

You can also call your local Bureau of Motor Vehicles branch — they keep a list of nearby certified stations and can tell you which ones have the shortest wait times. Many stations are run by tire shops, repair shops, or dedicated inspection facilities, so you have multiple options in most areas.

Walk-ins are usually accepted, but some stations take appointments. Calling ahead can save you time, especially during busy seasons like the end of the month when many people renew registrations.

What happens if your vehicle fails the emissions test

If your vehicle fails, you do not automatically lose your registration. You have 30 days from the test date to repair the problem and retest. The retest is free at the same station where you failed, as long as you return within that 30-day window.

Common reasons for failure include a faulty oxygen sensor, a loose or missing gas cap, or a check engine light that is on. Many of these repairs are inexpensive. If you are unsure what is wrong, the testing station can sometimes point you toward the likely problem, though they cannot diagnose the vehicle.

If you cannot afford repairs when ready, you can request a waiver from the BMV. Waivers are not automatic, but they are available for vehicles that fail by a small margin and have already had repairs attempted. Contact your local BMV branch to ask about the waiver process.

Renewing your registration after passing the test

Once you pass the emissions test, the station sends your results to the BMV electronically. You do not need to bring a paper receipt to the BMV — your registration file is updated automatically within one business day.

You can renew your registration online through the BMV website, by mail, or in person at any BMV branch. Online renewal is the fastest option and typically takes a few minutes. You will need your vehicle identification number (VIN) and current registration card.

Your registration renewal is not complete until you have both passed the emissions test and paid the registration fee to the BMV. Passing the test alone does not renew your registration.

What changed in Indiana emissions testing rules

Indiana has not expanded its emissions testing program since the 1990s. Marion County remains the only area with a testing requirement, and the state has not added new counties or changed the basic testing procedure in recent years.

The federal government periodically reviews whether Indiana's air quality meets Clean Air Act standards. If Marion County's air quality were to fall below federal thresholds, the state could be required to expand testing to other counties. This has not happened, and current air quality in the state remains in compliance.

Frequently Asked Questions

Do I need an emissions test if I just moved to Marion County?

Yes, if you are registering a vehicle in Marion County for the first time, you must pass an emissions test before the BMV will issue a registration. Bring your proof of residency, title, and proof of insurance along with your vehicle to a certified station.

What if I fail the test twice?

You have 30 days from your first test to retest for free. If you fail a second time, you can request a waiver from the BMV if the vehicle has had repairs attempted. Contact your local BMV branch to discuss your options — waivers are case-by-case.

Can I test my vehicle before my registration expires?

Yes. You can test your vehicle up to 120 days before your registration expires. This gives you time to make repairs if needed and still renew on schedule. The test results are valid for the full registration period once you pass.

Are there any counties besides Marion County that require emissions testing?

No. Marion County is the only county in Indiana with an emissions testing requirement. If you live outside Marion County, you do not need an emissions test to register your vehicle.

What if my vehicle has a check engine light on?

A check engine light will cause your vehicle to fail the emissions test. You need to have the problem diagnosed and repaired before you can pass. Many auto parts stores will read the diagnostic code for free, which can help you understand what needs to be fixed.