Ensuring tailpipe regulations do not limit the availability of new motor vehicles

(a) In general Section 202(a)(2) of the Clean Air Act (42 U.S.C. 7521(a)(2)) is amended— (1) by striking (2) Any regulation and inserting (2)(A) Any regulation; and (2) by adding at the end the following: (B) Any regulation, including a revision to a regulation, prescribed under paragraph (1), including any regulation prescribed after January 1, 2021, and any regulation proposed after the date of enactment of this subparagraph, shall not— (i) mandate the use of any specific technology; or (ii) result in limited availability of new motor vehicles based on the type of new motor vehicle engine in such new motor vehicles.. (b) Necessary revisions to regulations Not later than 24 months after the date of enactment of this Act, the Administrator of the Environmental Protection Agency shall promulgate such revisions to regulations as may be necessary to conform those regulations to subparagraph (B) of section 202(a)(2) of the Clean Air Act (42 U.S.C. 7521(a)(2)) (as added by subsection (a)).