What Hammond requires and where to get tested

Hammond, Indiana requires an emissions test as part of your vehicle registration renewal if your car is model year 1996 or newer. The test measures what comes out of your tailpipe—carbon monoxide, nitrogen oxides, and particulate matter—to confirm your vehicle meets state air quality standards. You cannot renew your registration without a passing test result on file.

The test itself takes about 10 minutes. A technician plugs a diagnostic machine into your vehicle's onboard computer port (located under the dashboard on the driver's side) and runs the engine through a short cycle. The machine reads emissions data directly from your car's systems and prints a pass or fail result on the spot.

Hammond is in Lake County, which is part of the Chicago nonattainment area—a region the EPA has designated as not meeting federal air quality standards. This is why the test is mandatory here, even though some Indiana counties do not require it. You can get tested at any Indiana Department of Environmental Management (IDEM) certified emissions testing station. These are typically independent repair shops, tire shops, or quick-lube facilities that have passed IDEM inspection and maintain the required equipment.

Key Takeaways

  • Hammond requires an emissions test for vehicles model year 1996 and newer as part of registration renewal, and you cannot register without a passing result.
  • The test plugs into your vehicle's onboard computer and takes about 10 minutes; you get a pass or fail result when ready.
  • You must use an IDEM-certified testing station, which you can find through the IDEM website or by calling your local Bureau of Motor Vehicles branch.
  • A passing test is valid for two years from the test date, so you do not need to test again until your next registration renewal cycle.
  • If you fail, the station will tell you what emissions systems are not working correctly, and you will need repairs before you can retest and register.

Finding a certified testing station in Hammond

The Indiana Department of Environmental Management maintains a searchable list of all certified emissions testing stations on its website. You can search by county (Lake County for Hammond) or by city. The list includes the station's address, phone number, and hours of operation.

Alternatively, visit or call your local Bureau of Motor Vehicles branch in Hammond. Staff there can give you names and addresses of nearby certified stations and may know which ones have the shortest wait times. Many stations do not require an appointment, but calling ahead to confirm hours and current wait times is worth the five minutes.

Bring your vehicle registration and proof of insurance. Some stations may ask for your driver's license as well. The cost of an emissions test in Indiana ranges from about $15 to $30, depending on the station; there is no state-set price, so you can call ahead and compare if cost matters to you.

What happens if your vehicle fails the test

If your vehicle fails, the testing station will print a detailed report showing which emissions systems did not meet standards. Common failure reasons include a faulty oxygen sensor, a malfunctioning catalytic converter, a loose or missing gas cap, or an engine control system problem that has triggered your check engine light.

You will need to have the vehicle repaired by a mechanic before you can retest. The station that tested you cannot perform repairs—that is a conflict of interest under IDEM rules—so you will take your vehicle to a separate repair shop. Bring the failure report with you; a good mechanic will use it to diagnose the problem faster.

Once repairs are complete, you can return to any certified testing station for a retest. There is no waiting period between a failed test and a retest, so you can go back the same day if the repairs are done. The retest costs the same as the initial test. You must have a passing result before you can renew your registration.

Timing and registration important date

Your emissions test must be completed before your vehicle registration expires. Check your registration card for the expiration date. You can take the test up to 30 days before your registration expires, and the result will be valid when you renew.

A passing emissions test is valid for two years from the date you took it. This means if you test in March 2024, that result covers you through March 2026, even if your registration renews in the middle of that period. You do not need to test again until the two-year window closes.

If your registration has already expired, you cannot legally drive the vehicle. Renew your registration first at the Bureau of Motor Vehicles, then take the emissions test, then return to the BMV with the test result to complete the renewal process. Some BMV locations allow you to submit the test result by mail or online after you have renewed, so ask when you visit.

Understanding your vehicle's onboard diagnostic system

Modern vehicles (1996 and newer) have an onboard diagnostic system called OBD-II that continuously monitors emissions equipment. When the emissions test technician plugs in, they are reading data that your car has already collected. This is why the test is quick—the machine is not measuring anything new; it is retrieving information your vehicle already knows about itself.

If your check engine light is on, your vehicle has detected a problem in the emissions system. You may still pass the test if the problem is minor and has not yet caused emissions to exceed limits. However, a check engine light is a sign that something needs attention, and it often leads to a failed test. Have the problem diagnosed before you test if possible.

Some vehicles have a "not ready" status in their diagnostic system, which can cause a test failure even if emissions are fine. This usually happens if you have recently replaced your battery, had the diagnostic system cleared, or driven fewer than 100 miles since that happened. If you get a "not ready" failure, drive the vehicle normally for a few days and retest.

What to do if you cannot get to Hammond for testing

If you live or work outside Hammond but registered your vehicle in Lake County, you can take the emissions test at any certified station in Indiana, not just in Hammond. The test result is valid statewide for registration renewal purposes. Find a station closer to you using the IDEM search tool and test there instead.

If you are unable to test before your registration expires due to vehicle breakdown or other hardship, contact the Lake County Bureau of Motor Vehicles to ask about a temporary registration extension. Extensions are not automatic, but the BMV may grant a short grace period if you can show you have scheduled a repair or test appointment.

Frequently Asked Questions

Can I test my vehicle before my registration expires?

Yes. You can take the emissions test up to 30 days before your registration expires, and the result will be valid when you renew. A passing test is good for two years, so testing early does not hurt.

What if my vehicle is too old or too new to test?

Vehicles model year 1996 and newer must test. Vehicles older than 1996 are exempt from the emissions test requirement in Hammond. Diesel vehicles and motorcycles have different rules; ask the testing station whether your vehicle type requires testing.

Do I need to make an appointment at a testing station?

Most stations accept walk-ins, but calling ahead to confirm hours and check wait times is a good idea. Some busy stations may have a short queue during peak hours, so early morning or mid-week visits are often faster.

What if I fail the test and cannot afford repairs right away?

Your registration will expire, and you cannot legally drive the vehicle. However, you can explore for a temporary registration extension from the Lake County BMV if you can show proof of a repair appointment. Some repair shops offer payment plans for emissions-related work.

Can I test a vehicle I just bought from another state?

Yes, but only after you have registered it in Indiana. You cannot test a vehicle with out-of-state plates. Register it first at the Bureau of Motor Vehicles, then take the emissions test, then complete your registration renewal with the test result.