Diesel Emissions Requirements

**2024 Diesel Emissions Requirements (GVWR up to 26000 lbs.)**
Model Year	Heavy-Duty Diesel	Frequency of Test	Testing Fee
2024	Exempt	n/a	n/a
2023	Exempt	n/a	n/a
2022	Exempt	n/a	n/a
2021	Renewal are Exempt	n/a	n/a
2021	Need test if Transfer of ownership	n/a	Rates vary per diesel testing center
2020	Need test	Every two years	Rates vary per diesel testing center
2019	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
2016	Need test	Every two years	Rates vary per diesel testing center
1993-2015*	Need test	Annually	Rates vary per diesel testing center
1976-1992 With Collector Plates	Need test	Every five years	Rates vary per diesel testing center
1976-1992 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	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 MSO (Manufacturer Statement of Origin) date of the vehicle. See 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.

**2024 Diesel Emissions Requirements (GVWR 26000 lbs. or more)**
Model Year	Heavy-Duty Diesel	Frequency of Test	Testing Fee
2024	Exempt	n/a	n/a
2023	Exempt	n/a	n/a
2022	Exempt	n/a	n/a
2021	Exempt	n/a	n/a
2020	Exempt	n/a	n/a
2019	Renewal are Exempt	n/a	n/a
2019	Need test if transfer of ownership	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
2016*	Need test	Every two years	Rates vary per diesel testing center
1992-2015	Need test	Annually	Rates vary per diesel testing center
1976-1991 With Collector Plates	Need Test	Every five years	Rates vary per diesel testing center
1976 - 1991 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 MSO (Manufacturer Statement of Origin) date of the vehicle. See 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.

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