UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 8-K-A

                                 CURRENT REPORT
     PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported):  December 1, 2003

                         CLEAN DIESEL TECHNOLOGIES, INC.
             (Exact name of registrant as specified in its charter)


            DELAWARE                000-27432              06-1393453
   (State or other jurisdiction    (Commission           (IRS Employer
        of incorporation)          File Number)        Identification No.)

                         SUITE 702, 300 ATLANTIC STREET
                                STAMFORD CT 06901
                                 (203) 327-7050
          (Address and Telephone Number of principal executive offices)



ITEM 7.  FINANCIAL STATEMENTS, PROFORMA FINANCIAL INFORMATION AND EXHIBITS.

(c)  Exhibits.

Exhibit  16.1  Description:

Letter,  dated  December  4,  2003, from Ernst & Young LLP to the Securities and
Exchange  Commission.


                                   SIGNATURES

     Pursuant  to  the  requirements of the Securities Exchange Act of 1934, the
Registrant  has  duly  caused  this  report  to  be  signed on its behalf by the
undersigned  hereunto  duly  authorized.

                                      Clean Diesel Technologies, Inc.

                                      By:  /s/  D.W.  Whitwell
                                           -------------------
                                           David  W.  Whitwell
                                      Vice President, Treasurer & Chief
                                            Financial Officer