Exhibit 10.2

FORM OF WARRANT

No. 3

THIS WARRANT HAS NOT BEEN AND WILL NOT REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR APPLICABLE STATE SECURITIES LAWS. THE HOLDER HEREOF, BY PURCHASING THIS WARRANT, AGREES FOR THE BENEFIT OF THE COMPANY THAT THIS WARRANT MAY NOT BE OFFERED, SOLD, PLEDGED, OR OTHERWISE TRANSFERRED BY SUCH HOLDER PRIOR TO THE LATER OF THE (X) SIX MONTHS FOLLOWING THE ISSUANCE HEREOF OR (Y) IF APPLICABLE, THREE MONTHS AFTER IT CEASES TO BE AN AFFILIATE, OTHER THAN (1) TO THE COMPANY, (2) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND IN ACCORDANCE WITH ANY APPLICABLE LAWS OF ANY STATE OF THE UNITED STATES, (3) IN AN OFFSHORE TRANSACTION COMPLYING WITH REGULATION S UNDER THE SECURITIES ACT, (4) PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY RULE 144, IF APPLICABLE, UNDER THE SECURITIES ACT OR (5) IN A TRANSACTION THAT DOES NOT REQUIRE REGISTRATION UNDER THE SECURITIES ACT BUT IS IN ACCORDANCE WITH APPLICABLE STATE SECURITIES LAWS AND IN RELATION TO WHICH THE HOLDER HAS FURNISHED TO THE COMPANY AN OPINION TO SUCH EFFECT FROM COUNSEL OF RECOGNISED STANDING IN FORM AND SUBSTANCE SATISFACTORY TO THE COMPANY PRIOR TO SUCH OFFER, SALE, PLEDGE OR TRANSFER. THE HOLDER HEREOF, BY ACCEPTANCE OF THIS WARRANT, REPRESENTS AND AGREES FOR THE BENEFIT OF THE COMPANY THAT IT IS A NON-U.S. PERSON, AND ACKNOWLEDGES THAT HEDGING TRANSACTIONS INVOLVING THIS WARRANT MAY NOT BE CONDUCTED UNLESS CONDUCTED IN COMPLIANCE WITH THE SECURITIES ACT. THIS WARRANT IS NOT IMMEDIATELY EXERCISEABLE.

February 16, 2012

5,000 Shares

Warrant for Purchase of Common Stock

of Clean Diesel Technologies, Inc.

(a Delaware Corporation)

This Certifies that Kanis S.A. (the “Holder”), with an address c/o S G Associates Limited, 82Z Portland Place, London, England, W1B 1NS, for value received and subject to the provisions hereinafter set forth is entitled to purchase from Clean Diesel Technologies, Inc., a Delaware corporation (the “Company”), 5,000 shares of Common Stock of the Company, par value $.01 per share (the “Shares”), at a price of $3.80 per share (the “Exercise Price”)¹ on or before 5:00 p.m. local time at the then executive offices of the Company on or prior to the Expiration Date (as defined below). This Warrant shall be void unless exercised on or before the Expiration Date.

1. Amendment of Notes. This Warrant is issued pursuant to the Amendment of the 8% Subordinated Convertible Promissory Note between the Holder and the Company (the “Notes”) and the issuances by the Company to the Holder of this Warrant on the date hereof.

2. Exercise; Expiration Date. This Warrant may be exercised from time to time by the Holder, on or after August 16, 2014, as to the whole or any lesser number of the Shares upon tender of this Warrant at the then executive office of the Company with a written notice signed by the Holder to the attention of the Company Secretary expressing the Holder’s intent to exercise the same together with payment to the Company of the Exercise Price of the Shares stated in the notice to be purchased. If this Warrant is exercised in respect of fewer than all of the Shares that may be purchased under this Warrant, the Company shall execute a new warrant in the form of this Warrant for the remaining Shares issuable under the original Warrant and deliver such new Warrant to the Holder.

This Warrant and all rights hereunder will expire if not exercised by 5:00 p.m. prevailing local time in New York, New York on the date (the “Expiration Date”) that is the earlier to occur of (i) August 16, 2017, and (ii) that date which is thirty (30) days after the giving of notice by the Company to the Holder that the Fair Market Value of one Share has exceeded 130% of the Exercise Price for ten (10) consecutive days (which 10-day period means, if the Shares are then listed or traded on an exchange or otherwise quoted, 10 consecutive days commencing on or after August 16, 2014 for which the Closing Bid Price is reported), and that the Warrant will therefore expire if not exercised prior to the Expiration Date.

“Fair Market Value” means (i) the consolidated closing bid price of one Share as reported on the NASDAQ Stock Market, LLC or on any other principal national securities exchange on which the Shares are then listed or admitted for trading or (ii) if the Shares are not then listed or admitted for trading on any national securities exchange, the last reported sale price or, in case no such sale takes place on each day during the 10-day period referred to above, the average of the highest reported bid and the lowest reported asked quotation for the Shares, either case as reported on any authorized interdealer quotation system (in each case, the “Closing Bid Price”). If the Shares are not listed or admitted for trading on any national securities exchange or quoted by any interdealer quotation system or a similar service, Fair Market Value means the fair market value of a Share as determined by a majority of the directors of the Company’s Board of Directors.

3. No Stockholder Rights. This Warrant does not confer upon the Holder or the Holder’s permitted Assignees any right whatsoever as a stockholder of the Company, including without limiting the generality of the foregoing, the right to vote, to receive notices and the right to receive dividends, prior to the exercise of the Holder’s rights to purchase the Shares as provided herein.

4. Compliance with Securities Laws. This Warrant and the Shares have not been registered under the Securities Act of 1933, as amended (the “Act”), or qualified under the securities laws of the several states of the United States (“State Laws”). The Holder is aware that the issuance of this Warrant and the issuance of the Shares are being made in reliance on Regulation S under the Act. This Warrant and the Shares have been purchased for investment and not with a view to distribution or resale, and may not be assigned, sold or made subject to a security interest, pledged, hypothecated, or otherwise transferred without an effective registration statement for such Warrant or Shares under the Act and qualification under State Laws, pursuant to an exemption from registration and qualification, or an opinion of counsel satisfactory to the Company that such registration and qualification are not required. Any Shares issued upon the exercise of this Warrant (unless pursuant to an effective registration statement under the Act) shall bear the following legend:

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THIS SECURITY HAS NOT BEEN AND WILL NOT REREGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR APPLICABLE STATE SECURITIES LAWS. THE HOLDER HEREOF, BY PURCHASING THIS SECURITY, AGREES FOR THE BENEFIT OF THE COMPANY THAT THIS SECURITY MAY NOT BE OFFERED, SOLD, PLEDGED, OR OTHERWISE TRANSFERRED BY SUCH HOLDER PRIOR TO THE LATER OF (X) SIX MONTHS FOLLOWING THE ISSUANCE HEREOF OR (Y) IF APPLICABLE, THREE MONTHS AFTER IT CEASES TO BE AN AFFILIATE, OTHER THAN (1) TO THE COMPANY, (2) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND IN ACCORDANCE WITH ANY APPLICABLE LAWS OF ANY STATE OF THE UNITED STATES, (3) IN AN OFFSHORE TRANSACTION COMPLYING WITH REGULATION S UNDER THE SECURITIES ACT, (4) PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY RULE 144, IF APPLICABLE, UNDER THE SECURITIES ACT OR (5) IN A TRANSACTION THAT DOES NOT REQUIRE REGISTRATION UNDER THE SECURITIES ACT BUT IS IN ACCORDANCE WITH APPLICABLE STATE SECURITIES LAWS AND IN RELATION TO WHICH THE HOLDER HAS FURNISHED TO THE COMPANY AN OPINION TO SUCH EFFECT FROM COUNSEL OF RECOGNISED STANDING IN FORM AND SUBSTANCE SATISFACTORY TO THE COMPANY PRIOR TO SUCH OFFER, SALE, PLEDGE OR TRANSFER. THE HOLDER HEREOF, BY PURCHASING THIS SECURITY, REPRESENTS AND AGREES FOR THE BENEFIT OF THE COMPANY THAT IT IS A NON-U.S. PERSON, AND ACKNOWLEDGES THAT HEDGING TRANSACTIONS INVOLVING THESE SECURITIES MAY NOT BE CONDUCTED UNLESS CONDUCTED IN COMPLIANCE WITH THE SECURITIES ACT.

5. Sale; Assignment. (a) This Warrant may not be transferred, sold, or made subject to a security interest or charge, pledged, hypothecated, or otherwise transferred absent compliance with the transfer restrictions set forth above in this Warrant.

(b) Upon such compliance with the transfer restrictions and upon the delivery to the Company at its then executive offices of this Warrant along with a duly completed Assignment Form substantially in the form of Exhibit A hereto (and the required legal opinion, if any), the Company shall execute and deliver a new Warrant in the form of this Warrant (including the legend set forth above on the first page hereof, unless registered under the Act and any applicable State Laws), but registered in the name of the assignee, to purchase the number of Shares or that fraction of the Shares issuable under the original Warrant assigned to the assignee. In case the Holder shall assign this Warrant with respect to fewer than all of the Shares that may be purchased under this Warrant, the Company shall execute a new warrant in the form of this Warrant for the balance of such Shares or the remaining fraction of the Shares issuable under the original Warrant and deliver such new warrant to the Holder.

(c) Any transfer or sale or attempted transfer or sale of this Warrant in violation of any provision of this Warrant shall be void, and the Company shall not record such transfer on its books or treat any purported transferee of the Warrant as the owner of the Warrant for any purpose.

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6. Representations of Holder. The Holder represents and covenants to the Company by acceptance of this Warrant, as follows:

(a) That the Holder is not a U.S. Person (as defined in Rule 902 of Regulation S promulgated under the Act and is not acquiring the Warrant for the account or benefit of any U.S. Person.

(b) The Holder acquired this Warrant from the Company and will acquire Shares issuable upon exercise hereof, for its own account, for investment purposes only and not with a view to the resale and distribution thereof, in whole or in part.

(c) The Holder shall comply with the transfer restrictions set out above and in the Commitment Letter (including, without limitation, Schedule C attached thereto and made a part thereof) and the Holder understands that this Warrant and the Shares issuable on exercise hereof must be held indefinitely unless subsequently registered under the Act and qualified under any applicable State Laws, or unless exemptions from registration and qualification are otherwise available.

(d) The Holder acknowledges and agrees that hedging transactions involving this Warrant or the Shares issuable upon exercise of this Warrant may not be conducted unless conducted in compliance with the Act.

7. Capital Adjustments. The Exercise Price and the number of Shares purchasable hereunder are subject to adjustment from time to time, as follows:

(a) If at any time there shall be a merger or consolidation of the Company with or into another corporation when the Company is not the surviving corporation, then, as part of such merger or consolidation, lawful provision shall be made so that the Holder shall thereafter be entitled to receive upon exercise of this Warrant, during the period specified herein and upon payment of the aggregate Exercise Price then in effect, the number of Shares of stock or other securities or property of the successor corporation resulting from such merger or consolidation, to which the Holder would have been entitled in such merger or consolidation, if this Warrant had been exercised immediately before such merger or consolidation.

(b) If the Company at any time shall, by subdivision, combination or reclassification of securities or otherwise, change any of the Shares into the same or a different number of securities of any other class or classes, this Warrant shall thereafter represent the right to acquire such number and kind of securities as would have been issuable as the result of such change with respect to the Shares immediately prior to such subdivision, combination, reclassification or other change.

(c) If the Company at any time shall split or subdivide its Common Stock, the Exercise Price shall be proportionately decreased and the number of Shares issuable pursuant to this Warrant shall be proportionately increased. If the Company at any time shall combine its Common Stock, the Exercise Price shall be proportionately increased and the number of Shares issuable pursuant to this Warrant shall be proportionately decreased.

8. Governing Law. This Warrant shall be governed by and construed for all purposes by in accordance with the laws of the State of Delaware without reference to the conflicts of laws rules of any jurisdiction.

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9. Notices. Any notice effecting an exercise of this Warrant shall, if in writing, be effective upon receipt by the Company of the Warrant, notice of exercise and payment of the Exercise Price. Other notices shall, if in writing, be effective on receipt, if delivered in person or by facsimile transmission, or, if given by mail, four (4) days after deposit in the mail service, air-mail postage pre-paid, in any case to the then executive office of the Company to the attention of the Company Secretary, or, if to the Holder, to the address given above or to such other address by notice so given.

10. Holidays. If the last or appointed day for the taking of any action or the expiration of any right required or granted herein shall be a Saturday, Sunday or a legal holiday, then such action may be taken or such right may be exercised on the next succeeding day not a Saturday, Sunday or a legal holiday.

11. Lost Warrants. The Company covenants with the Holder that, upon receipt of evidence reasonably satisfactory to the Company of the loss, theft, destruction or mutilation of this Warrant and, in the case of any such loss, theft, or destruction, upon receipt of an indemnity reasonably satisfactory to the Company, or in the case of any such mutilation, upon surrender and cancellation of such Warrant, the Company will make and deliver a new Warrant of like tenor, in lieu of the lost, stolen, destroyed or mutilated Warrant.

12. Fractional Shares. Fractional Shares may not be purchased hereunder. In lieu of fractional Shares the Holder shall be entitled to receive a cash payment equal to the fair market value for such fractional share. Fair market value shall be the consolidated closing bid price on the NASDAQ Stock Market, LLC on the date of exercise, or, if the Shares are not listed on such exchange, the closing price on such recognized exchange on which the Shares may then be listed, or, if the Shares shall not be listed on an exchange, then the average of the bid and asked prices of the Shares, if the Shares are traded in an over-the-counter market, or, if not regularly traded in an over the counter market, or if the Directors of the Company determine that the trading prices do not represent fair value, then such fair value as determined by the Directors.

14. Headings. The headings in this Warrant are for convenience of reference only and shall in no way modify or affect the meaning or construction of any of the terms or provisions of this Warrant.

[Signature page follows.]

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WITNESS the seal of the Company and the signature of its duly authorized officers as of the date first written above.

CLEAN DIESEL TECHNOLOGIES, INC.

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Exhibit A to Warrant

Form of Assignment

[To be executed only upon permitted transfer of Warrant]

To: Clean Diesel Technologies, Inc.

For value received, the undersigned registered holder of the attached Warrant hereby sells, assigns and transfers unto [insert name of transferee] pursuant to and in accordance with the terms of such Warrant, the right represented by such Warrant to purchase Shares of Clean Diesel Technologies, Inc. to which such Warrant relates and appoints Attorney to make such transfer on the books of Clean Diesel Technologies, Inc. maintained for such purpose, with full power of substitution in the premises.

Warrant Holder

Signed in the presence of:

Date:

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TRANSFER RESTRICTIONS

The Warrants and Warrant Shares (collectively, the “Warrant Securities”) have not been registered under the U.S. Securities Act of 1933, as amended (the “Securities Act”), and may not be offered or sold to or for the account or benefit of “U.S. Persons” (as defined in Rule 902 of Regulation S promulgated under the Securities Act), except pursuant to Regulation S, the registration requirements of the Securities Act or an exemption from the registration requirements of the Securities Act.

Accordingly, the Warrant Securities are being placed outside the U.S. to non-U.S. Persons in an offshore transaction in reliance on Regulation S under the Securities Act. The terms “United States” and “U.S. Person” have the respective meanings given to those terms in Regulation S under the Securities Act.

Each holder of Warrant Securities will be deemed to have represented and agreed as follows:

THIS SECURITY HAS NOT BEEN AND WILL NOT REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR APPLICABLE STATE SECURITIES LAWS. THE HOLDER HEREOF, BY PURCHASING THIS SECURITY, AGREES FOR THE BENEFIT OF THE COMPANY THAT THIS SECURITY MAY NOT BE OFFERED, SOLD, PLEDGED, OR OTHERWISE TRANSFERRED BY SUCH HOLDER PRIOR TO THE LATER OF THE (X) SIX MONTHS FOLLOWING THE ISSUANCE HEREOF OR (Y) IF APPLICABLE, THREE MONTHS AFTER IT CEASES TO BE AN AFFILIATE, OTHER THAN (1) TO THE COMPANY, (2) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND IN ACCORDANCE WITH ANY APPLICABLE LAWS OF ANY STATE OF THE UNITED STATES, (3) IN AN OFFSHORE TRANSACTION COMPLYING WITH REGULATION S UNDER THE SECURITIES ACT, (4) PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY RULE 144, IF APPLICABLE, UNDER THE SECURITIES ACT OR (5) IN A TRANSACTION THAT DOES NOT REQUIRE REGISTRATION UNDER THE SECURITIES ACT BUT IS IN ACCORDANCE WITH APPLICABLE STATE SECURITIES LAWS AND IN RELATION TO WHICH THE HOLDER HAS FURNISHED TO THE COMPANY AN OPINION TO SUCH EFFECT FROM COUNSEL OF RECOGNISED STANDING IN FORM AND SUBSTANCE SATISFACTORY TO THE COMPANY PRIOR TO SUCH OFFER, SALE, PLEDGE OR TRANSFER. THE HOLDER HEREOF, BY PURCHASING THIS SECURITY, REPRESENTS AND AGREES FOR THE BENEFIT OF THE COMPANY THAT IT IS A NON-U.S. PERSON, AND ACKNOWLEDGES THAT HEDGING TRANSACTIONS INVOLVING THESE SECURITIES MAY NOT BE CONDUCTED UNLESS CONDUCTED IN COMPLIANCE WITH THE SECURITIES ACT.