Oklahoma Code § 47-12-423

Title 47. Motor Vehicles: Emission control system - Disconnection, alteration,
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modification, or replacement.
A.  On any motor vehicle originally designed and equipped with
an emission control system such system shall be maintained in good
working order.

B.  No person shall:
1.  Disconnect any part of such system except temporarily in
order to make repairs, replacements, or adjustments;
2.  Modify or alter such system or its operation in any manner;
or
3.  Operate, and no owner shall cause or permit to be operated,
any motor vehicle originally equipped with such system while any
part of that system is known by the owner to be disconnected or
while that system or its operation is modified or altered in any
manner.
C.  The provisions of this section shall not apply to any
disconnection, alteration, modification, or replacement of a nature
intended to increase effectiveness of the system in controlling the
emission of air pollutants.

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