What Fort Collins Emissions Testing Requires

Fort Collins requires emissions testing for most vehicles registered in the city, with the test covering exhaust pollutants and onboard diagnostic systems. The Colorado Department of Transportation (CDOT) sets the standards, but the City of Fort Collins enforces them locally. You'll need to pass this test to renew your vehicle registration or transfer ownership within the city limits.

The test itself takes about 30 minutes at an authorized testing station. A technician will connect your vehicle to a dynamometer (a machine that measures emissions while your engine runs under load) and check your vehicle's onboard diagnostic system for fault codes. The station will print a report showing whether you passed or failed, and that result goes directly to the Colorado Division of Motor Vehicles.

Key Takeaways

  • Fort Collins emissions testing is required for vehicle registration renewal and costs between $25 and $35 depending on the testing station.
  • You can find authorized testing stations through the Colorado Department of Transportation website or by calling your local DMV office.
  • Vehicles older than model year 1981 and motorcycles are exempt from testing requirements.
  • If your vehicle fails, you have 60 days to make repairs and retest at no additional charge at the same station.
  • The test measures tailpipe emissions and checks your vehicle's onboard diagnostic system for warning lights or fault codes.

Which Vehicles Need Testing in Fort Collins

Most gasoline-powered vehicles registered in Fort Collins need emissions testing, but there are specific exemptions. Vehicles manufactured before 1981 do not require testing, nor do motorcycles, mopeds, or vehicles registered as antiques. Diesel vehicles have different requirements depending on their model year and weight—check with your testing station about your specific vehicle.

Electric vehicles do not require emissions testing. If you're unsure whether your vehicle falls under the exemption, the testing station can tell you when you call or visit. You can also contact the City of Fort Collins Air Quality Division at (970) 224-6000 to confirm your vehicle's status before scheduling.

Finding an Authorized Testing Station

The Colorado Department of Transportation maintains a searchable list of all authorized emissions testing stations on its website. You can filter by location and find stations near you in Fort Collins. Most stations are independent repair shops, tire shops, or dedicated emissions testing facilities—not all dealerships perform this service.

Call ahead before visiting. Many stations accept walk-ins, but some operate by appointment only, especially during peak times (typically late in the month when people renew registrations). Ask about their hours, whether they take your vehicle type, and what payment methods they accept. Costs typically range from $25 to $35 per test.

What Happens During the Test

When you arrive, bring your vehicle registration and a valid ID. The technician will ask for your vehicle's mileage and note any visible damage or maintenance issues. They'll then connect your vehicle to the dynamometer, which simulates driving conditions while measuring what comes out of your tailpipe.

The test also reads your vehicle's onboard diagnostic system—the computer that monitors engine performance. If your check engine light is on, the vehicle will likely fail because the diagnostic system has detected a problem. The technician cannot turn off the light or clear fault codes; you must have the underlying issue repaired first. The entire process takes 20 to 30 minutes, and you'll receive a printed report when ready.

Passing, Failing, and Retesting

A passing result means your vehicle meets Colorado's emissions standards and you can proceed with registration renewal. The testing station sends the result electronically to the Colorado Division of Motor Vehicles, so you don't need to carry paperwork to the DMV.

If you fail, the report will show which pollutants exceeded limits or which diagnostic codes triggered the failure. You have 60 days to repair your vehicle and retest at the same station at no additional charge. Common failure reasons include a faulty oxygen sensor, a loose gas cap, or a malfunctioning catalytic converter. Many repair shops can diagnose and fix these issues for $100 to $500 depending on the problem. After repairs, return to the same testing station for your retest—you don't pay again if you retest within 60 days.

Timing and Registration Renewal

You must complete emissions testing before you can renew your vehicle registration in Fort Collins. The test result is valid for 90 days, so plan to test within that window of your registration expiration date. If your registration expires on June 30, for example, you should test between April 1 and June 30.

Once you have a passing result, you can renew your registration online through the Colorado Division of Motor Vehicles, by mail, or in person at a county clerk's office. The testing station does not handle registration—it only provides the emissions result. Keep your test report until your registration is fully renewed in case you need to show proof.

Frequently Asked Questions

What if my check engine light is on?

Your vehicle will fail the emissions test if the check engine light is illuminated because it signals that your onboard diagnostic system has detected a fault. You must have the problem diagnosed and repaired before retesting. A mechanic can read the fault code for $50 to $100 and advise you on repairs needed.

Can I test in a different city and use the result in Fort Collins?

Yes. Colorado's emissions testing is statewide, so a passing result from any authorized station in the state is valid for Fort Collins registration. If you travel or move temporarily, you can test elsewhere and the result will transfer.

What if I just bought a used vehicle in Fort Collins?

If you're transferring ownership, you'll need a passing emissions test before the title transfer is complete. The seller may have already tested the vehicle—ask for proof. If not, you can test it yourself before or after purchase, depending on your agreement with the seller.

How much does emissions testing cost?

Testing costs between $25 and $35 per test at most Fort Collins stations. Retests within 60 days of a failure are free at the same station. Prices vary slightly by location, so call ahead if cost is a concern.

What if my vehicle is registered outside Fort Collins but I live here?

You must follow the emissions requirements of the county where your vehicle is registered, not where you live. If your registration is in a county that doesn't require testing, you don't need to test in Fort Collins. However, if you transfer your registration to Larimer County (where Fort Collins is located), you'll then need to comply with local requirements.