Colorado Code § 42-4-406

Requirement of certification of emissions control for registration - testing for diesel smoke opacity compliance
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(1) (a) A diesel vehicle in the program area that is
registered or required to be registered pursuant to article 3 of this title, routinely operates in the
program area, or is principally operated from a terminal, maintenance facility, branch, or
division located within the program area shall not be sold, registered for the first time, or
reregistered unless such vehicle has been issued a certification of emissions control within:
(I) The past twelve months if the motor vehicle is a heavy-duty diesel vehicle that is over
ten model years old;
(II) The last twenty-four months if the motor vehicle is a heavy-duty diesel vehicle that
is ten model years old or newer;
(III) The last twelve months if the motor vehicle is a light-duty diesel vehicle that is at
least ten model years old or that is model year 2003 or older; or
(IV) The last twenty-four months if the motor vehicle is a light-duty diesel vehicle that is
ten model years old or newer and that is model year 2004 or newer.
(b) (I) A certification of emissions control shall be issued to any diesel vehicle that has
been inspected and tested pursuant to subsection (2) of this section for diesel smoke opacity
compliance and was found at such time to be within the smoke opacity limits established by the
commission.
(II) Notwithstanding subparagraph (I) of this paragraph (b), new diesel vehicles,
required under this section to have a certification of emissions control, shall be issued a
certification of emissions compliance without inspection or testing. Prior to the expiration of the
certification, the owner shall have the vehicle inspected and shall obtain a certification of
emissions control for diesel smoke opacity compliance. The certificate shall expire on the
earliest to occur of the following:
(A) The anniversary of the day of the issuance of the certification when the vehicle has
reached its fourth model year if it is a light-duty diesel vehicle;
(B) The anniversary of the day of the issuance of the certification when the vehicle has
reached its fourth model year if it is a heavy-duty diesel vehicle;
(C) The anniversary of the day of the issuance of the certification when the vehicle has
reached its sixth model year if the vehicle has a gross vehicle weight rating of twenty-six
thousand pounds or more and it is of a model year of 2014 or newer; or
(D) On the date of the transfer of ownership if the date is within twelve months before
the certification would expire under sub-subparagraph (A), (B), or (C) of this subparagraph (II),
unless the transfer of ownership is a transfer from the lessor to the lessee.
(2) (a) On or after January 1, 1990, all heavy duty diesel vehicles in the program area not
subject to the provisions of section 42-4-414, with fleets of nine or more, shall be required to be
tested for diesel smoke opacity compliance at a licensed diesel inspection station by submitting
to loaded mode opacity testing utilizing dynamometers or on-road tests as prescribed by the
commission.
(b) Light-duty diesel vehicles in the program area shall be required to be tested for diesel
smoke opacity compliance at a licensed diesel inspection station by submitting to loaded mode
opacity testing utilizing dynamometers.

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