<SUBMISSION>
<ACCESSION-NUMBER>0001181431-09-045011
<TYPE>4/A
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20090921
<FILING-DATE>20090924
<DATE-OF-FILING-DATE-CHANGE>20090924
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>Nia Mehran
<CIK>0001386428
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4/A
<ACT>34
<FILE-NUMBER>001-33264
<FILM-NUMBER>091084300
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>17150 SOUTH MARGAY AVENUE
<CITY>CARSON
<STATE>CA
<ZIP>90746
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>U.S. Auto Parts Network, Inc.
<CIK>0001378950
<ASSIGNED-SIC>5531
<IRS-NUMBER>680623433
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>0102
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>17150 SOUTH MARGAY AVENUE
<CITY>CARSON
<STATE>CA
<ZIP>90746
<PHONE>(310) 715-6666
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>17150 SOUTH MARGAY AVENUE
<CITY>CARSON
<STATE>CA
<ZIP>90746
</MAIL-ADDRESS>
</ISSUER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>rrd253665.xml
<DESCRIPTION>4/A
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2009-09-21</periodOfReport>

    <dateOfOriginalSubmission>2009-09-24</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001378950</issuerCik>
        <issuerName>U.S. Auto Parts Network, Inc.</issuerName>
        <issuerTradingSymbol>PRTS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001386428</rptOwnerCik>
            <rptOwnerName>Nia Mehran</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O US AUTO PARTS NETWORK</rptOwnerStreet1>
            <rptOwnerStreet2>INC., 17150 MARGAY AVENUE</rptOwnerStreet2>
            <rptOwnerCity>CARSON</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90746</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2009-09-21</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2009-09-21</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>400</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>5.50</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5775882</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Nia Living Trust dated September 2, 2004</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>213979</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Mehran Nia Annuity Trust, Extablished November 18, 2006</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>213979</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Fariba Nia Annuity Trust, Established November 18, 2006</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">These shares are owned directly by the Nia Living Trust, Established September 2, 2004 and indirectly by Mehran Nia as co-trustee of the trust, of which Mr. Nia is a beneficiary.  These shares were sold under a 10b5-1 plan established on August 27, 2009.</footnote>
        <footnote id="F2">These shares are owned directly by the Mehran Nia Annuity Trust, Established November 18, 2006 and indirectly by Mehran Nia as co-trustee and sole beneficiary of the trust.</footnote>
        <footnote id="F3">These shares are owned directly by the Fariba Nia Annuity Trust, Established November 18, 2006 and indirectly by Mehran Nia as a co-trustee of the trust, the sole beneficiary of which is Mr. Nia's spouse.  Mr. Nia disclaims beneficial interest in each of the foregoing trusts except to the extent of his pecuniary interest therein.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/Mehran Nia</signatureName>
        <signatureDate>2009-09-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
