Certified Emissions Inspectors

Iron Buffalo Diesel Dyno & Emissions inspectors are licensed by the State of Colorado to perform emissions testing for medium and heavy duty diesel vehicles over a Gross Vehicle Weight (GVW) of 14,000.

Experts in smog testing, opacity reading & Customer Service

Air quality improvements are one of the main reasons emissions testing (and smog testing) are so heavily mandated in Colorado. We all want to be able to see the mountains and breathe fresh air and our smog testing contributes to a cleaner, less polluted Denver.

During the smog inspection, a licensed technician will mount measuring equipment to your vehicle. The technician then runs a series of tests including pollution inspection, visual inspection, and practical inspection. The goal here is to ensure that your vehicle's emission equipment is present, operating, and effectively removing contaminants from the exhaust of your vehicle.

During the inspections, we measure carbon monoxide (CO), carbon dioxide (CO2), hydrocarbons (HC) and oxygen levels.

Emissions Test Completion

What happens if I pass the smog and emissions test?

If your vehicle passes the smog check and emissions inspection, the technician will provide you with a VIR (Vehicle Inspection Report) which is a copy of the test results.

What happens if I fail the smog and emissions test?

If your vehicle fails the smog check and emissions inspection, you'll receive a VIR along with a list of repair recommendations.

Emissions issues are generally affordable and quick to repair. If you think your vehicle might not pass, we've got you covered. Operating alongside Iron Buffalo Diesel Dyno & Emissions is Iron Buffalo Truck & Trailer, our heavy truck repair facility. In the event that you vehicle fails emissions testing, we can resolve the issues (often same day) and in the same building.

Customer Reviews

Kelsey Sailsbery

Great customer service. Happy to find a place that can do all the different varieties of work on my truck from tailgate to engine to tires👍

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Jay D

Great customer service.

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J Jamison

Quick easy very nice people very professional

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