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Gray Market Vehicles

Non-U.S.-certified vehicles, sometimes referred to as "gray market" vehicles are those manufactured for sale and use in other countries. These vehicles may or may not come equipped with all of the emissions control components required on all U.S. vehicles.

In order to pass the Denver-area emissions test, these vehicles must be properly retrofitted, or the owner must present state-approved paperwork for an exemption. Such vehicles must be evaluated at an emissions technical center operated by the Colorado Department of Public Health and Environment (CDPHE). For information or an appointment, call 303-744-2442 (and press 3). Paperwork from this evaluation (state form DR 2365) must be presented to the emissions testing center in order to obtain an emissions test. Save this evaluation paperwork as it must be presented at all future emissions tests on the vehicle.

Kit, Custom and Similar Vehicles

Vehicles in this category may include reconstructed, rebuilt, street rod, home made and kit cars. For further information, contact your county motor vehicle registration office, or the Emissions Program Office at the Colorado Division of Motor Vehicles at 303-205-5603. Most of these vehicles are tested with the idle test rather than the I/M 240 test.

In general, these vehicles that have Colorado-assigned identification numbers in lieu of a Vehicle Identification Number (VIN), and all such vehicles must be evaluated at an emissions technical center operated by the Colorado Department of Public Health and Environment. Paperwork from this evaluation must be presented to the emissions testing center in order to obtain an emissions test. Save this evaluation paperwork as it must be presented at all future emissions tests on the vehicle.

Non-Standard Tire Sizes

Tires larger than 34 inches cannot be tested on the dynamometer for safety reasons. Nonstandard (not manufacturer-equipped) oversized tires will need to be replaced with standard-size tires for your vehicle in order to be tested on the dyne. This does not apply to 1981 and older vehicles, which are not tested on the dyne. Vehicles with non-standard tires of over 34 inches will be rejected from testing.

Vehicle Identification Numbers (VINs)

If your gray market or kit-type vehicle does not have a VIN number, you must obtain a Colorado-assigned identification number from the Colorado State Patrol. Following that, you must obtain an evaluation and form DR 2365 from a state emissions technical center. Without these two pieces of paperwork, emissions testing centers will not test your vehicle. For more information, contact the Division of Motor Vehicles' Emissions Program Office at 303-205-5603, or a CDPHE emissions technical center at 303-744-2442 (press 3).

More Info

List of I/M 240 test exceptions
List of vehicles exempt from all emissions testing