Exhibit 24.2

Power of Attorney

The undersigned hereby constitutes and appoints each of Jason Trevisan,
Javier Zamora, Suzanne Murray and Ariel Borgendale signing singly, in any,
and all capacities, and with full power of substitution, the undersigned's
true and lawful attorney-in-fact to:

(1) execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer, director or holder of 10% or more of a registered class
of securities of CarGurus, Inc. (the "Company"), from time to time the following
U.S. Securities and Exchange Commission ("SEC") forms: (i) Form ID, including
any attached documents, to effect the assignment of codes to the undersigned to
be used in the transmission of information to the SEC using the EDGAR System;
(ii) Form 3, Initial Statement of Beneficial Ownership of Securities, including
any attached documents; (iii) Form 4, Statement of Changes in Beneficial
Ownership of Securities, including any attached documents; (iv) Form 5,
Annual Statement of Beneficial Ownership of Securities in accordance with
Section 16(a) of the Securities Exchange Act of 1934, as amended (the "Exchange
Act"), and the rules thereunder, including any attached documents; and
(v) amendments of each thereof, in accordance with the Exchange Act, and
the rules thereunder, including any attached documents;

(2) do and perform any and all acts for and on behalf of the undersigned
which may be necessary or desirable to complete and execute any such Form 3, 4
or 5 or any amendment(s) thereto, and timely file such form(s) with the SEC and
any securities exchange, national association or similar authority; and

(3) take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of benefit to,
in the best interest of, or legally required by, the undersigned, it being
understood that the documents executed by such attorney-in-fact on behalf
of the undersigned pursuant to this Power of Attorney shall be in such form and
shall contain such terms and conditions as such attorney-in-fact may approve in
such attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact, acting singly,
full power and authority to do and perform any and every act and thing
whatsoever requisite, necessary or proper to be done in the exercise of any of
the rights and powers herein granted, as fully to all intents and purposes as
the undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this Power of Attorney and the
rights and powers herein granted. The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Exchange Act.

This Power of Attorney shall remain in full force and effect until the earliest
to occur of (a) the undersigned is no longer required to file such forms with
respect to the undersigned's holdings of and transactions in securities issued
by the Company, (b) revocation by the undersigned in a signed writing delivered
to the foregoing attorneys-in-fact or (c) with respect to each attorney-in-fact,
such time as such attorney shall no longer be employed by the Company.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of August 24, 2023.


/s/ Dafna Sarnoff
Dafna Sarnoff