Which counties require a passing emissions test to register a vehicle?
- Portions of Adams
- Portions of Arapahoe
- Portions of Larimer
- Portions of Weld
- Portions of El Paso
- The 2021 emissions requirements for a diesel vehicle
- Can I register my diesel vehicle online?
Yes. Effective June 1, 2017 all diesel vehicles that do require a passing emission test (Boulder, Jefferson, Broomfield, Denver and Douglas Counties, and portions of Adams, Arapahoe, Larimer, Weld and El Paso counties) are eligible for online renewal.
Diesel emission testing facilities charge up to one-hour of the posted labor rates, so fees will vary. Contact the specific station for fees.Please click here for a list of Licensed Diesel Emissions Testing Stations