Where to Get Your Vehicle Tested in Aurora

Aurora has two main routes for emissions testing: you can visit a state-certified emissions testing station or use a mobile testing unit that operates at specific locations on set days. The state-certified stations are privately owned businesses licensed by Colorado to perform the test, and they're scattered throughout Aurora and the surrounding area. You'll find them listed on the Colorado Department of Public Health and Environment (CDPHE) website under their emissions testing station locator.

The mobile units are operated by the Colorado Department of Transportation (CDOT) and appear at different Aurora locations throughout the year — typically in parking lots or municipal facilities. These units charge the same fee as fixed stations and serve the same purpose, but they operate on a rotating schedule. If you prefer a fixed location you can visit any weekday, a private station is more reliable. If you want to catch a mobile unit, check the CDOT schedule first to confirm it's coming to your area.

Both types of stations test the same way and produce the same result. The difference is convenience: private stations stay in one place year-round, while mobile units come to you but only on certain dates. Neither is faster or more lenient than the other.

Key Takeaways

  • Aurora residents can test at private certified stations (year-round, fixed locations) or state mobile units (rotating schedule, specific dates).
  • The test itself takes 10 to 15 minutes and costs around $25 to $30, depending on your vehicle type.
  • You need your vehicle registration and proof of insurance to bring to the station.
  • If your vehicle fails, you have 60 days to repair it and retest at no additional charge at the same station.
  • Vehicles registered in Aurora must test every two years, or every year if your vehicle is model year 1981 or older.

What Documents and Information You Need

Bring your current vehicle registration and proof of insurance. The registration shows your vehicle's identification number (VIN), model year, and engine type — all of which the testing station needs to run the correct test protocol. Proof of insurance can be a printed card, a digital image on your phone, or a letter from your insurance company. The station won't contact your insurer; they just need to confirm you have coverage.

If your vehicle is registered to someone else (a family member, a business, or a co-owner), bring that person's registration. The test is tied to the registered owner, not the person driving it. If you're testing a vehicle you recently purchased but haven't yet registered in Colorado, bring the bill of sale and your out-of-state registration to show the station what you're working with — they can advise whether you need to register first or can test on the temporary permit.

Do not bring your title or loan documents. The station only needs registration and insurance. If you've lost your registration, contact the Colorado Division of Motor Vehicles (DMV) before you go; you'll need it to test.

How the Test Works and What Happens During It

The technician will ask you to pull into a bay, turn off your engine, and stay in the vehicle. They'll connect a probe to your vehicle's tailpipe — this probe measures the emissions coming out of your exhaust. The test runs for about 10 to 15 minutes. During that time, your engine will be running at idle and at a higher RPM (the technician controls this from outside). You'll see the probe in your tailpipe and hear the engine rev slightly, but you don't need to do anything.

The machine records the levels of nitrogen oxides, carbon monoxide, carbon dioxide, and particulate matter. It compares these levels to the standard for your vehicle's model year and engine type. If all readings fall within the allowed range, you pass. If any reading exceeds the limit, you fail.

The whole process takes longer to describe than to experience. Most people are in and out in 20 to 30 minutes, including the time you spend checking in and waiting for your turn. You'll receive a printed receipt showing whether you passed or failed, and the station will submit the result to the state electronically.

What to Do If Your Vehicle Fails

A failure means your vehicle's emissions are above the legal limit for at least one pollutant. You have 60 days from the test date to repair the vehicle and retest. The retest is free at the same station where you failed — you don't pay the testing fee again. You do need to bring your registration and insurance again, along with the original failing receipt.

Common reasons for failure include a faulty oxygen sensor, a loose or missing gas cap, a malfunctioning catalytic converter, or an engine that's running too rich (burning too much fuel). A mechanic can run a diagnostic scan to identify the problem. If the repair is expensive, you may want to get a second opinion from another shop before committing.

If you repair the vehicle and retest within the 60-day window, the retest result is what counts — the original failure disappears from your record. If you don't retest within 60 days, your registration will not renew, and you cannot legally drive the vehicle in Colorado. Once you do repair it and retest successfully, you can renew your registration.

Testing Frequency and Registration Renewal

In Aurora, vehicles registered after 1981 must test every two years. Vehicles registered in 1981 or earlier must test every year. Your registration paperwork will show when your test is due — it's usually tied to your registration expiration date. If your registration expires in June, your emissions test must be completed by June as well.

You can test up to 60 days before your registration expires. Testing early doesn't extend your registration; it just means you can renew your registration sooner. Many people test in the month before their registration expires to avoid a last-minute rush.

If you move out of Aurora but stay in Colorado, you'll follow the same testing schedule for your new county. If you move out of Colorado entirely, you no longer need to test in Colorado, but you'll need to follow the testing rules of your new state.

Finding a Testing Station and Checking Hours

The Colorado Department of Public Health and Environment maintains a searchable list of all certified emissions testing stations on their website. You can filter by county (Arapahoe County includes Aurora) and see each station's address, phone number, and hours. Some stations are open early morning, some stay open into the evening, and a few are open on Saturdays. Call ahead if you're planning to visit on a Saturday or outside normal business hours — not all stations keep the same schedule.

If you prefer to use a mobile unit, the CDOT website publishes the schedule several months in advance. The units typically appear at locations like municipal parking lots or community centers. You can check the schedule to see when a unit will be near you, then plan your visit accordingly. Mobile units usually operate during business hours and do not require an appointment.

Bring your registration and insurance, and plan for 20 to 30 minutes. If the station is busy, you might wait longer, but the test itself is quick.

Cost and Payment Methods

The testing fee in Colorado is set by the state and is the same at all certified stations. As of the most recent update, the fee is approximately $25 to $30 for most vehicles, with a slightly higher fee for diesel vehicles. The exact amount can vary slightly by station and may change annually, so call ahead if you want to confirm the current price.

Most stations accept cash, debit cards, and credit cards. A few accept only cash, so if you're visiting a specific station for the first time, ask about payment methods when you call to confirm their hours. If you fail and need to retest, the retest is free — you only pay once per testing cycle.

Frequently Asked Questions

Can I test my vehicle if the check engine light is on?

Yes, you can test with the check engine light on. However, if the light is on because of an emissions-related problem, you will likely fail the test. The technician will still run the test and give you the result. If you fail, you'll need to have the problem diagnosed and repaired before you retest.

What if I just bought a used car and haven't registered it in Colorado yet?

You must register the vehicle in Colorado before you can test it. Contact the Colorado DMV to register it first. Once registered, you'll receive a registration card showing when your first test is due. New registrations typically give you until the end of the month to complete your first test.

Do I need an appointment to test at a private station?

Most private stations operate on a walk-in basis and do not require an appointment. However, some busy locations may accept appointments during peak times. Call the station you plan to visit and ask whether they take appointments or operate first-come, first-served.

What happens if I test in Aurora but my vehicle is registered in a different Colorado county?

You can test anywhere in Colorado, regardless of where your vehicle is registered. The result is submitted to the state under your registration, and it counts toward your home county's requirement. There's no penalty for testing outside your county.

Can I renew my registration online if I pass the emissions test?

Yes. Once you pass the test, the result is submitted electronically to the state. You can renew your registration online through the Colorado DMV website, by mail, or in person at a DMV office. You do not need to bring the emissions test receipt to renew your registration — the state already has the result.