If the test was performed in a state that does not offer emission inspections, a Verification of Vehicle Identification Number (Form 2698) must also be included. Once the vehicle inspection is completed, the car owner must send the test results to the Colorado DMV with a completed Application for an Affidavit of Emissions Extension (Form DR 2376). If this region does not offer testing, any law enforcement officer may complete the inspection. However, the state allows for testing to be done outside of CO, with a little extra paperwork.Ĭolorado residents who need to take have an inspection completed must first find a smog test provider in their temporary place of residence. The regular emissions testing requirement for Colorado residents is mandatory even if the car owner is living in another state temporarily. Out-of-State Emissions Testing in Colorado A collector’s vehicle with the model year of 1975 or older.A motorcycle, farm vehicle, moped or horseless carriage.Some parts of Adams, Arapahoe, Larimer, and Weld CountyĮmissions testing in Colorado is not required if the vehicle is:.Car owners living within the following counties are required to take their vehicle in for a smog inspection: Residents living outside of these counties are not subject to Colorado emissions testing, except in very special cases. Vehicle inspections are only compulsory for certain Colorado counties. Even within these counties, the vehicle inspections are not mandatory for all vehicles. Vehicle testing is only mandatory in certain counties in the state, particularly those that are at risk for high smog levels. Smog Check Exemptions in ColoradoĮmissions testing in Colorado is not required for all vehicles. Independent smog certification providers must be sought for diesel vehicle owners, as the Colorado Department of Public Health & Environment does not administer testing for diesel-powered vehicles. The test for these types of vehicles does not require the car to be taken in for a physical inspection. The DMV smog test for low-emissions vehicles is the RapidScreen Roadside test. Gasoline-fueled cars manufactured before 1982 will undergo the two-speed idle test. It is possible to pass the treadmill smog test even if the “check engine” indicator is on. The vehicle inspection for cars that are at least 12 years old but have a model year no earlier than 1982 will include the I/M 240 dynamometer test.

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