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<?xml version="1.0" encoding="windows-1252"?> |
<ownershipDocument> |
| <schemaVersion> X0306 </schemaVersion> |
| <documentType> 4 </documentType> |
| <periodOfReport> 2020-09-01 </periodOfReport> |
| <issuer> |
| | <issuerCik> 0001065696 </issuerCik> |
| | <issuerName> LKQ CORP </issuerName> |
| | <issuerTradingSymbol> LKQ </issuerTradingSymbol> |
| | </issuer> |
| <reportingOwner> |
| | <reportingOwnerId> |
| | | <rptOwnerCik> 0001790347 </rptOwnerCik> |
| | | <rptOwnerName> Franz Arnd </rptOwnerName> |
| | | </reportingOwnerId> |
| | <reportingOwnerAddress> |
| | | <rptOwnerStreet1> C/O LKQ CORPORATION </rptOwnerStreet1> |
| | | <rptOwnerStreet2> 500 WEST MADISON STREET, SUITE 2800 </rptOwnerStreet2> |
| | | <rptOwnerCity> CHICAGO </rptOwnerCity> |
| | | <rptOwnerState> IL </rptOwnerState> |
| | | <rptOwnerZipCode> 60661 </rptOwnerZipCode> |
| | | <rptOwnerStateDescription></rptOwnerStateDescription> |
| | | </reportingOwnerAddress> |
| | <reportingOwnerRelationship> |
| | | <isDirector> false </isDirector> |
| | | <isOfficer> true </isOfficer> |
| | | <isTenPercentOwner> false </isTenPercentOwner> |
| | | <isOther> false </isOther> |
| | | <officerTitle> SVP-Issuer and CEO-LKQ Europe </officerTitle> |
| | | <otherText></otherText> |
| | | </reportingOwnerRelationship> |
| | </reportingOwner> |
| <nonDerivativeTable> |
| | <nonDerivativeTransaction> |
| | | <securityTitle> |
| <value> Common Stock </value> |
| </securityTitle> |
| | | <transactionDate> |
| <value> 2020-09-01 </value> |
| </transactionDate> |
| | | <deemedExecutionDate></deemedExecutionDate> |
| | | <transactionCoding> |
| <transactionFormType> 4 </transactionFormType> |
| <transactionCode> F </transactionCode> |
| <equitySwapInvolved> false </equitySwapInvolved> |
| <footnoteId id="F1"/> |
| </transactionCoding> |
| | | <transactionTimeliness></transactionTimeliness> |
| | | <transactionAmounts> |
| <transactionShares> |
| <value> 1650 </value> |
| </transactionShares> |
| <transactionPricePerShare> |
| <value> 31.6655 </value> |
| </transactionPricePerShare> |
| <transactionAcquiredDisposedCode> |
| <value> D </value> |
| </transactionAcquiredDisposedCode> |
| </transactionAmounts> |
| | | <postTransactionAmounts> |
| <sharesOwnedFollowingTransaction> |
| <value> 104950 </value> |
| </sharesOwnedFollowingTransaction> |
| </postTransactionAmounts> |
| | | <ownershipNature> |
| <directOrIndirectOwnership> |
| <value> D </value> |
| </directOrIndirectOwnership> |
| </ownershipNature> |
| | | </nonDerivativeTransaction> |
| | </nonDerivativeTable> |
| <derivativeTable></derivativeTable> |
| <footnotes> |
| | <footnote id="F1"> This transaction represents shares withheld by the issuer to pay the tax withholding amount required upon the vesting of restricted stock units. </footnote> |
| | </footnotes> |
| <remarks></remarks> |
| <ownerSignature> |
| | <signatureName> /s/ Victor M. Casini, Attorney-in-fact </signatureName> |
| | <signatureDate> 2020-09-02 </signatureDate> |
| | </ownerSignature> |
| </ownershipDocument> |