Exhibit 23(a)
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, 333-33276 and 333-117057) of our report
dated January 26, 2005 relating to our audit of the financial statements for the
year  ended December 31, 2004 of Clean Diesel Technologies, Inc. included in the
2004  annual  report  on  Form  10-K.





/s/ Eisner LLP
New York, New York
March 24, 2005