Redesignates existing paragraphs (1)–(11) as paragraphs (2)–(12); inserts paragraph headings for paragraphs (1)–(11); and replaces the matter preceding paragraph (2) (as redesignated) to add a new paragraph (1) defining 'Catalytic converter' with subparts (A)–(C).

Amends subsection (c) to insert an additional paragraph (3) requiring a certification that the catalytic converter will be marked in accordance with sections 33101 through 33104; redesignates an existing paragraph (3) as paragraph (4); and adds a new subsection (f) establishing requirements for marking catalytic converters, including promulgation of regulations and allowance for unique part identification numbers included in a database accessible by law enforcement.

Amends paragraph (7) of 49 U.S.C. 33101 to add ‘the catalytic converter’ as subparagraph (L), redesignate existing subparagraph (L) as (M), adjust punctuation in subparagraph (K), and update cross-referential language in the redesignated subparagraph (M) to refer to subparagraphs (A) through (L).

Amends 49 U.S.C. 33111 by redesignating existing subsections (b) and (c) as (c) and (d), modifies the subsection (a) heading, and inserts a new subsection (b) establishing definitions (including ‘precious metals’ and ‘unique part identification number’), requiring sellers of motor vehicle parts containing precious metals to provide specified seller and vehicle/part identification information to purchasers, and requiring retention of that information for at least 2 years.

Adds new section 671 to title 18 (Theft of catalytic converters), defining 'catalytic converter' and 'precious metals', making it unlawful to steal or knowingly take a catalytic converter or to knowingly purchase one with intent to distribute/sell/dispose in interstate or foreign commerce, and establishing penalties (fines under title 18 and imprisonment up to 5 years; concurrent sentences provision).

Inserts a definition for 'Precious metals' into section 2311 of title 18, defining the term by reference to section 109–27.5101 of title 41, Code of Federal Regulations, or any successor regulation.

Adds subsection (d) to section 2321 of title 18, defining 'catalytic converter' (including diesel oxidation catalysts and diesel particulate filters), making it unlawful to buy/receive/possess/control a catalytic converter knowing it was stolen with intent to sell/dispose, and prescribing penalties (fines under title 18 and imprisonment up to 5 years; concurrent sentencing provision).

Revises subsection (b) of section 2322 to redefine 'chop shop' to cover premises where persons receive, conceal, destroy, disassemble, dismantle, reassemble, store, or otherwise alter motor vehicles or parts unlawfully obtained, including actions to extract precious metals or remove/alter identifying marks, and to distribute, sell, or dispose of the vehicle/part or extracted precious metal in interstate or foreign commerce.