I 
119TH CONGRESS 
1ST SESSION H. R. 5221 
To prevent the theft of catalytic converters and other precious metal car 
parts, and for other purposes. 
IN THE HOUSE OF REPRESENTATIVES 
SEPTEMBER 9, 2025 
Mr. BAIRD (for himself, Ms. MCCOLLUM, Mrs. DINGELL, Ms. CRAIG, Mr. 
MAGAZINER, Mr. COSTA, Mr. MANN, Mr. CARTER of Georgia, and Mr. 
BABIN) introduced the following bill; which was referred to the Com-
mittee on Energy and Commerce, and in addition to the Committees on 
Transportation and Infrastructure, and the Judiciary, for a period to be 
subsequently determined by the Speaker, in each case for consideration 
of such provisions as fall within the jurisdiction of the committee con-
cerned 
A BILL 
To prevent the theft of catalytic converters and other 
precious metal car parts, and for other purposes. 
Be it enacted by the Senate and House of Representa-
tives of the United States of America in Congress assembled, 
SECTION 1. SHORT TITLE. 
This Act may be cited as the ‘‘Preventing Auto Recy-
cling Theft Act’’ or the ‘‘PART Act’’. 
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SEC. 2. CATALYTIC CONVERTER DEFINED. 
In this Act, the term ‘‘catalytic converter’’ means any 
of the following: 
(1) Any device installed in the exhaust system 
of an internal combustion engine that utilizes cata-
lytic action to oxidize hydrocarbon (HC) and carbon 
monoxide (CO) emissions to carbon dioxide (CO2) 
and water (H2O). 
(2) A diesel oxidation catalyst. 
(3) A diesel particulate filter. 
SEC. 3. REQUIREMENTS FOR NEW MOTOR VEHICLES RE-
LATING TO CATALYTIC CONVERTERS. 
(a) IN GENERAL.—Not later than 180 days after the 
date of the enactment of this Act, the National Highway 
Traffic Safety Administration shall— 
(1) revise the motor vehicle theft prevention 
standard in section 541.5 of title 49, Code of Fed-
eral Regulations, to include catalytic converters 
among the parts specified in subsection (a) of such 
section; and 
(2) update such regulations as are necessary to 
ensure that the requirements added by paragraph 
(1) apply to any vehicle covered by part 565 of such 
title. 
(b) APPLICABILITY.—Notwithstanding any provision 
of chapter 331 of title 49, United States Code, in the case 
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of a vehicle described in paragraph (2) of subsection (a) 
that has not been sold to the first purchaser (as defined 
in section 33101 of such title), the requirements added 
by paragraph (1) of such subsection shall apply to the ve-
hicle beginning on the date that is 6 months after the Sec-
retary makes the revision and updates required by such 
subsection, regardless of the model year of the vehicle or 
the date on which the vehicle is manufactured. 
(c) COMPLIANCE.—The identifying number affixed or 
inscribed required for catalytic converters under the revi-
sion described in subsection (a)(1) may include a unique 
part identification number that is included in a database 
that— 
(1) is accessible by law enforcement; and 
(2) allows for the retrieval of the full vehicle 
identification number of the motor vehicle in which 
the catalytic converter was originally installed based 
on that part identification number. 
(d) AMENDMENTS TO ADD DEFINITION OF CATA-
LYTIC CONVERTER.—Section 33101 of title 49, United 
States Code, is amended— 
(1) in the matter preceding paragraph (1), by 
striking ‘‘In this chapter—’’ and inserting ‘‘In this 
chapter:’’; 
(2) in each of paragraphs (1) through (11)— 
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(A) by inserting ‘‘The Term’’ after the 
enumerator; and 
(B) by adding a paragraph heading the 
text of which comprises the term defined in the 
paragraph; 
(3) by redesignating paragraphs (1) through 
(11) as paragraphs (2) through (12), respectively; 
and 
(4) by inserting before paragraph (2) (as so re-
designated) the following: 
‘‘(1) CATALYTIC CONVERTER.—The term ‘cata-
lytic converter’ means any of the following: 
‘‘(A) Any device installed in the exhaust 
system of an internal combustion engine that 
utilizes catalytic action to oxidize hydrocarbon 
(HC) and carbon monoxide (CO) emissions to 
carbon dioxide (CO2) and water (H2O). 
‘‘(B) A diesel oxidation catalyst. 
‘‘(C) A diesel particulate filter.’’. 
(e) MARKING
OF CATALYTIC CONVERTERS NOT-
WITHSTANDING AN EXEMPTION.—Section 33106 of title 
49, United States Code, is amended— 
(1) in subsection (c)— 
(A) in paragraph (2), by striking ‘‘; and’’ 
and inserting a semicolon; 
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(B) by redesignating paragraph (3) as 
paragraph (4); and 
(C) by inserting after paragraph (2) the 
following: 
‘‘(3) a certification that the catalytic converter 
will be marked in accordance with sections 33101 
through 33104, including any associated regulation; 
and’’; and 
(2) by adding at the end the following: 
‘‘(f) REQUIREMENTS FOR MARKING CATALYTIC CON-
VERTERS.— 
‘‘(1) IN GENERAL.—The Administrator of the 
National Highway Traffic Safety Administration 
shall promulgate regulations that require a catalytic 
converter on a vehicle line to be marked conspicu-
ously in accordance with sections 33101 through 
33104, including any associated regulation. 
‘‘(2) UNIQUE
PART
IDENTIFICATION
NUM-
BERS.—In promulgating regulations under para-
graph (1), the Administrator of the National High-
way Traffic Safety Administration shall allow for a 
marking described in that paragraph to include a 
unique part identification number (as defined in sec-
tion 33111(b)(3)) that is included in a database that 
is accessible by law enforcement and that allows for 
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