Colorado Department of Revenue
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Diesel Vehicles

 

Diesel Gas Pump

 

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.

 

 

  

Diesel Vehicle Emissions Testing Cycles
Vehicle Type
How Often Test is Required

 

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)

 

Exempt

 

Light-duty 2004 and newer but more than four years old

 

or

 

Heavy-duty less than ten years old but more than four years old

 

Every two years

 

 

Light-duty 2003 and older

or 

Heavy-duty ten years old

 

Every year

 

Diesel Vehicle Gross Vehicle Weight Ratings (GVWR) Definitions

Light-duty diesel vehicle

GVWR of 14,000 lbs. or less

Heavy-duty diesel vehicle

GVWR of 14,001 lbs. or more