What you need to know about Loveland's emissions requirements

Loveland is in Larimer County, which sits in the Denver metro area's air quality region. That means your vehicle must pass an emissions test before you can register it — not just once, but every two years if you own a gasoline car, or every year if you own a diesel vehicle. The test measures what comes out of your tailpipe: hydrocarbons, carbon monoxide, and nitrogen oxides. If your car fails, you cannot renew your registration until you fix the problem and retest.

The test itself is straightforward. You drive to an approved testing station in Larimer County, the technician plugs a probe into your vehicle's tailpipe, and the machine reads the emissions for about 30 seconds. The whole visit takes 10 to 15 minutes. You pay a fee — Larimer County charges around $25 to $30 per test, though the exact amount varies by testing station. If you pass, you get a certificate that goes to the county clerk's office when you renew your registration. If you fail, you get a detailed report showing which pollutants exceeded the limit.

Key Takeaways

  • Loveland vehicles must pass an emissions test every two years for gasoline engines or every year for diesel engines before registration renewal.
  • The test takes 10 to 15 minutes at any approved Larimer County testing station and costs between $25 and $30.
  • A failed test means your vehicle has an emissions system problem — usually the oxygen sensor, catalytic converter, or fuel system — that must be repaired before you can retest.
  • You can find approved testing stations through the Colorado Department of Public Health and Environment website or by calling Larimer County Air Quality.
  • Some repairs may have access to for a fee waiver if your household income is below 200% of the federal poverty line.

When your vehicle is due for testing

Your emissions test is due every two years if you drive a gasoline vehicle, or every year if you drive a diesel vehicle. The due date is tied to your vehicle registration expiration date — you cannot renew your registration without a passing test certificate. Loveland does not send reminders, so mark your registration renewal date on a calendar or set a phone alert about two months before it expires.

New vehicles registered in Colorado are exempt from testing for their first four model years. After that, they enter the regular two-year cycle. If you move to Loveland from another state, your vehicle must pass a test before you can get a Colorado registration, even if it just passed inspection elsewhere.

Finding an approved testing station in Larimer County

You cannot test at just any repair shop. The Colorado Department of Public Health and Environment maintains a list of certified emissions testing stations. In Larimer County, there are roughly 15 to 20 approved stations spread across Fort Collins, Loveland, and surrounding areas. You can search for stations by city and county on the state health department's website, or call Larimer County Air Quality at (970) 498-6000 to ask which stations are closest to you and whether they have same-day appointments available.

Most testing stations are independent repair shops or tire shops that have been certified to run the emissions equipment. They are not affiliated with the county or state — they are private businesses that charge the testing fee and send your results to the state electronically. Some stations are busier than others, especially in the weeks before registration important date, so calling ahead to book an appointment can save you a wait.

What happens when your vehicle fails the test

A failed emissions test means your vehicle is releasing pollutants above the legal limit. The test report will tell you which pollutants are too high — usually carbon monoxide, hydrocarbons, or nitrogen oxides — which narrows down where the problem is. The most common causes are a faulty oxygen sensor, a damaged catalytic converter, a fuel system leak, or a problem with the engine's computer controls.

You have 60 days from the test date to fix the vehicle and retest. During that 60-day window, you can still drive the vehicle — you just cannot renew your registration. Once you have the repair done, you return to any approved testing station and pay the testing fee again. If you pass the retest, you get a new certificate and can complete your registration renewal. If you fail again, you have another 60 days to fix it and retest.

If you cannot afford the repair, Loveland and Larimer County have a repair information program. Households earning below 200% of the federal poverty line may be able to get help paying for emissions-related repairs or a fee waiver for retesting. Contact Larimer County Air Quality at (970) 498-6000 to ask about current information options, as funding and may be able to access rules change year to year.

Common emissions problems and what they cost to fix

The oxygen sensor is the most frequent culprit in a failed emissions test. It tells the engine how much fuel to burn, and when it fails, the engine runs too rich or too lean. Replacing an oxygen sensor typically costs $150 to $400 depending on which sensor and your vehicle model. A catalytic converter failure is more expensive — $800 to $2,500 — but less common unless your vehicle is very old or has been running badly for a long time.

Fuel system leaks, a loose gas cap, or a faulty fuel pressure regulator can also cause failures. These repairs range from $50 for a gas cap replacement to $300 to $600 for a fuel pressure regulator. Engine computer problems are rarer but can be harder to diagnose; a shop may need to run a full diagnostic scan, which costs $100 to $150, before they know what to fix. If you fail a test, get a diagnostic scan at a trusted repair shop before you assume what the problem is.

How to prepare your vehicle for the emissions test

The best preparation is regular maintenance. Keep your oil changed on schedule, replace your air filter every 12,000 to 15,000 miles, and have any check engine light diagnosed and repaired right away. A check engine light usually means a sensor or emissions system component has failed, and that is exactly what the emissions test will catch.

Before you go to the testing station, make sure your vehicle has been driven for at least 20 minutes so the engine is fully warmed up. The test is more accurate on a warm engine. Also, fill your gas tank at least a quarter full — the testing equipment needs fuel vapor in the tank to measure correctly. If your vehicle has been sitting unused for weeks, drive it for a few days before testing to let the engine computer relearn its settings.

Renewing your registration after a passing test

Once you have a passing emissions certificate, take it to the Larimer County Clerk and Recorder's office in Fort Collins or to any county clerk satellite office, or renew online through the Colorado Department of Revenue website if your vehicle qualifies for online renewal. You will need your current registration, proof of insurance, and the emissions test certificate. The registration renewal fee varies by vehicle weight and age but typically ranges from $100 to $200. You can also renew by mail if you prefer not to visit an office in person.

Your new registration is valid for two years (or one year if you drive a diesel vehicle). Mark your calendar for two years from now so you do not miss the next test important date.

Frequently Asked Questions

Can I test my vehicle in a different county and use that result in Loveland?

No. Loveland is in the Denver metro air quality region, and you must test at a station in that region — which includes Larimer, Boulder, Broomfield, Adams, Arapahoe, Douglas, Jefferson, and Weld counties. You can choose any approved station in those counties, but the test must happen in the region.

What if I just bought a used car and it fails the emissions test?

You have 60 days from the test date to fix it and retest. If the seller told you the vehicle was in good condition and it fails when ready after purchase, you may have a claim under Colorado's used car lemon law, depending on the vehicle's age and mileage. Contact the Colorado Attorney General's office or a consumer protection attorney for information on your specific situation.

Do electric vehicles need emissions testing?

No. Electric vehicles produce zero tailpipe emissions and are exempt from testing. Hybrid vehicles that have a gasoline engine must test, even though they use the engine less often than a conventional car.

What happens if I miss the test important date and my registration expires?

Driving with an expired registration is illegal in Colorado. You cannot renew your registration without a passing emissions test. If your registration has already expired, you must test, pass, and then renew your registration before you drive the vehicle again. Penalties for expired registration include fines and potential vehicle impound.

Can I get a waiver if my vehicle is old or has high mileage?

Colorado does not grant emissions test waivers based on vehicle age or mileage. However, if your household income is below 200% of the federal poverty line, you may be able to get help paying for repairs or a fee waiver for retesting. Call Larimer County Air Quality at (970) 498-6000 to ask about current information programs.