Colorado Department of Revenue

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 and Arapahoe, Larimer, Weld, and El Paso.

 

Gross Vehicle Weight Rating (GVWR)

  • Heavy-duty diesel vehicles - GVWR of 14,001 lbs. or more.
  • Light-duty diesel vehicles - GVWR of 14,000 or less.

Cost

The diesel emission testing facilities can charge up to one-hour of the posted labor rates.  There is no set fee.

 

Temporarily Exempt Vehicles

  • Heavy-duty and light-duty diesel vehicles are exempt from emissions for the first four model years. After the exemption period, vehicles are required to be tested as instructed in Vehicle Emissions Testing Cycles below.

 

Vehicle Emissions Testing Cycles

Light-duty diesels that are 2003 and older are required to have an emissions test every year .

Light-duty diesels that are 2004 and newer are required to have an emissions test every 2 years.

Heavy-duty diesels that are less than 10 model years old are to have an emissions test every 2 years.

Heavy-duty diesels that are more than 10 model years old are to have an emissions test every year.