Leading the world in emission solutions

EXHIBIT 10.1

Leading the world in emission solutions

March 21, 2014

Xxxxx X.X.

c/o SGA Nominees Limited

000 Xxx Xxxxxxxxxx Xxxx

London NW1 5QT

Dear Xx. Xxxxx:

This letter reflects our agreement regarding the Amended 8% Subordinated Convertible Promissory Note (the “Note”), which is attached to this letter. 

As amended on February 16, 2012, the Note provides that maturity of the Note may be accelerated at the Holder’s election to a date not earlier than May 12, 2013. 

Xxxxx X.X. xxxxxx acknowledges and confirms that it will not elect to accelerate the maturity of the Note prior to July 1, 2015. 

Please sign and return this letter to us indicating your agreement. 

We thank you for your continued support of Clean Diesel Technologies, Inc.  If you have any questions, or would like to discuss any of the documents, please do not hesitate to contact me.

Sincerely,

CLEAN DIESEL TECHNOLOGIES, INC.

By:/s/Xxxxxx X. Xxxxx

      Xxxxxx X. Xxxxx

      Chief Financial Officer

Agreed and Affirmed:

By:/s/Xxxxx Xxxx

Xxxxx Xxxx for Xxxxx Services LLC

Company Secretary

Xxxxx X.X.

21 March 2014

0000 Xxxxxxxxx Xxxx, Xxxxx 000, Xxxxxxx XX 00000    ●    Tel x0-000-000-0000    ●     Fax x0-000-000-0000    ●     xxx.xxxx.xxx