What Indiana Requires for Emissions Testing

Indiana requires emissions testing for most vehicles registered in the state, but the rules depend on where you live and how old your car is. If you live in a county that participates in Indiana's vehicle emissions program — primarily Marion County (Indianapolis) and a few surrounding counties — your vehicle must pass an emissions test every two years as part of your registration renewal. Vehicles that are model year 1996 and newer are subject to testing; older vehicles are exempt.

The Indiana Department of Environmental Management (IDEM) oversees the program. You cannot renew your vehicle registration without a passing emissions test result if you live in a covered county. If you live outside these counties, emissions testing is not required by the state, though your vehicle must still meet federal standards.

The test itself measures your vehicle's exhaust to may support it meets state and federal pollution standards. A certified emissions testing station performs the test, which typically takes 10 to 15 minutes and costs between $15 and $25, depending on the station.

Key Takeaways

  • Emissions testing is required only in certain Indiana counties, primarily Marion County and surrounding areas; check your county's requirements before scheduling.
  • Your vehicle must be model year 1996 or newer to be subject to testing, and you must pass before you can renew your registration.
  • The test measures your exhaust emissions and takes about 10 to 15 minutes at a certified testing station.
  • You can find certified stations through the IDEM website or by calling your local county health department.
  • If your vehicle fails, you have options to repair it and retest, or in some cases request a waiver if repairs are too expensive.

Which Indiana Counties Require Emissions Testing

Marion County (which includes Indianapolis) is the primary area where emissions testing is mandatory. Several surrounding counties in the Indianapolis metropolitan area also participate in the program, though the exact list can change. The counties included are determined by air quality standards and federal requirements.

To find out whether your county requires testing, contact your local county health department or visit the IDEM website. You can also check when you attempt to renew your vehicle registration online — the system will tell you whether a test is required for your address. If you are unsure, calling your county clerk's office is the fastest way to get a definitive answer.

How to Find a Certified Emissions Testing Station

Indiana maintains a list of certified emissions testing stations on the IDEM website. You can search by county or city to find stations near you. Most stations are independently operated repair shops or service centers that have been certified to perform the test.

When you call or visit a station, ask whether they have availability and how long the wait typically is. Some stations accept walk-ins, while others require appointments. Bring your vehicle registration and a valid photo ID. The station will need your vehicle identification number (VIN), which is on your registration or visible on the driver's side of your windshield.

You do not need to schedule the test at any particular time relative to your registration renewal — you can test at any point during the two-year cycle. However, many people test close to their renewal date to avoid forgetting.

What Happens During an Emissions Test

The test itself is straightforward. The technician will connect a probe to your vehicle's exhaust pipe and measure the levels of pollutants in your exhaust. The machine records whether your vehicle meets the state's pollution standards. The entire process usually takes 10 to 15 minutes.

Your vehicle must be in reasonably good running condition to pass. Common reasons for failure include a faulty oxygen sensor, a malfunctioning catalytic converter, or problems with the fuel injection system. If your check engine light is on, your vehicle will likely fail the test.

If you pass, the testing station will provide you with a passing certificate or send the result directly to the Indiana Bureau of Motor Vehicles (BMV). You can then renew your registration online, by mail, or in person at a BMV branch. If you fail, the station will give you a report showing which emissions were out of range.

What to Do If Your Vehicle Fails the Emissions Test

If your vehicle fails, you have two main options: repair the vehicle and retest, or request a waiver. Most people choose to repair the vehicle, since the cost of repairs is often less than the cost of a waiver or the penalty for driving with an expired registration.

After you repair your vehicle, you can return to any certified testing station for a retest. There is no additional fee for the retest itself, though you will pay the standard testing fee again. You have until your registration expires to pass the test and renew your registration.

If repairs are too expensive or your vehicle is very old, you may be able to request a waiver. A waiver allows you to renew your registration without a passing test, but you must meet specific conditions — typically, the cost of repairs must exceed a certain percentage of your vehicle's value, or your vehicle must be in a specific age range. Contact your local county health department or the IDEM to learn whether you may have access to for a waiver and how to request one.

How to Renew Your Registration After Passing the Test

Once you have a passing emissions test result, you can renew your vehicle registration. Most certified testing stations send results directly to the BMV, so you may not need to do anything — your registration renewal system will show that the test has been completed.

You can renew your registration online through the Indiana BMV website, by mail, or in person at a BMV branch. Online renewal is the fastest option and typically takes a few minutes. You will need your vehicle registration number and a valid payment method. Registration renewal fees vary based on your vehicle type and weight.

If you renew online or by mail, your new registration sticker will arrive by mail within one to two weeks. If you renew in person at a BMV branch, you can receive your sticker when ready. Keep your registration and proof of emissions testing in your vehicle, as law enforcement may ask to see them during a traffic stop.

Frequently Asked Questions

Do I have to test my vehicle every year?

No. In Indiana, emissions testing is required every two years as part of your registration renewal cycle. Once you pass the test and renew your registration, you do not need to test again until your registration is due for renewal two years later.

What if I just moved to Indiana from out of state?

If you move to a county that requires emissions testing, you must pass a test before you can register your vehicle in Indiana. Contact your local county health department or BMV branch to find out the specific requirements for your new address and whether your vehicle is subject to testing.

Can I test my vehicle before my registration expires?

Yes. You can test your vehicle at any time during your two-year registration cycle. Many people test a few months before their registration expires to avoid a last-minute rush. The test result is valid for your entire registration period.

What if the testing station says my vehicle cannot be tested?

Some vehicles — such as those with severe mechanical problems or those that cannot safely run on a dynamometer — may not be testable. If this happens, ask the station for documentation of why the test could not be performed. Contact your county health department to discuss your options, which may include a waiver or alternative testing procedures.

How much does an emissions test cost in Indiana?

The cost typically ranges from $15 to $25, depending on the testing station. Some stations may charge slightly more or less. Call ahead to confirm the price at your chosen station before you visit.