Exhibit 23(b)

            Consent of Independent Registered Public Accounting Firm


We  consent  to  the  incorporation  by reference in the Registration Statements
(Forms  S-8  No.33-33276, No.33-16939 and No. 333-117057) pertaining to the 1994
Incentive  Plan  of  Clean Diesel Technologies, Inc. of our report dated January
24,  2003,  with  respect to the statements of operations, stockholders' equity,
and  cash  flows  for  the  year  ended December 31, 2002 included in the Annual
Report (Form 10-K) for the year ended December 31, 2004.


/s/ Ernst & Young LLP

Stamford, Connecticut
March 24, 2005