Diesel Emissions Requirements | Department of Revenue

2026 Diesel Emissions Requirements (GVWR up to 26000 lbs.)
Model Year	Light-Duty Diesel	Frequency of Test	Testing Fee
2026	Exempt	n/a	n/a
2025	Exempt	n/a	n/a
2024	Renewal are Exempt	n/a	n/a
2023	Need test if Transfer of ownership	n/a	Rates vary per diesel testing center
2022	Need test	Every two years	Rates vary per diesel testing center
2021	Need test	Every two years	Rates vary per diesel testing center
2020	Need test	Every two years	Rates vary per diesel testing center
2018	Need test	Every two years	Rates vary per diesel testing center
2017	Need test	Every two years	Rates vary per diesel testing center
1994-2016*	Need test	Annually	Rates vary per diesel testing center
1976-1994 With Collector Plates	Need test	Every five years	Rates vary per diesel testing center
1976-1994 Without Collector Plates	Need test	Annually	Rates vary per diesel testing center
1976 or newer Grandfathered**	Exempt	n/a	n/a
1975 and older With Collector Plates	Exempt	n/a	n/a
1975 and older without Collector Plates	Need test	Annually	Rates vary per diesel testing center

*Transition from biennial to annual testing is based on the model year of the vehicle. See your local County DMV for more information.

** Vehicles model year 1976 or newer that have been registered as a "collector's item" prior to September 1, 2009, and the registration has never lapsed or expired or had a change of ownership.