EXHIBIT 23.1


CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


We  consent  to  the incorporation by reference in the registration statement on
Form  S-8  (Registration  No.  333-16939)  of our report dated February 18, 2004
relating  to  our  audit  of the December 31, 2003 financial statements of Clean
Diesel  Technologies,  Inc.  included in the 2003 annual report on Form 10-K, as
amended.



/s/ Eisner LLP

New York, New York
December 22, 2004