Diesel Vehicles
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Diesel Emissions Program Area
The full counties of Boulder, Jefferson, Broomfield, Denver, and Douglas, and the partial counties of Adams, Arapahoe, Larimer, Weld, and El Paso.
A quick reference map is available here. If you are unsure of whether or not a diesel test is required in your area, please contact your local county motor vehicle office.
Cost and Locations
The diesel emission testing facilities can charge up to one-hour of the posted labor rates. There is no set fee.
Find a testing station by clicking here for a list or here for a map.
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Diesel Vehicle Emissions Testing Cycles |
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Vehicle Type |
How Often Test is Required |
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New light-duty or new heavy-duty in the first four model years (if the vehicle is being sold in its last year of exemption, it requires an inspection for sale)
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Exempt |
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Light-duty 2004 and newer but more than four years old
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Heavy-duty less than ten years old but more than four years old
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Every two years
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Light-duty 2003 and older or Heavy-duty ten years old
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Every year |
Diesel Vehicle Gross Vehicle Weight Ratings (GVWR) Definitions |
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Light-duty diesel vehicle |
GVWR of 14,000 lbs. or less |
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Heavy-duty diesel vehicle |
GVWR of 14,001 lbs. or more |