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Assuming that this is a US 2004 Toyota Sienna... If you go to Toyota's FAQ site, http://toyota.custhelp.com/ , and search for "timing" then you'll find this document titled "Timing Belt and Timing Chain" which lists all US sold Toyota vehicles and whether they have a timing belt or timing chain/gear: http://toyota.custhelp.com/cgi-bin/toyot... The 1998-2006 US Toyota Sienna uses a timing belt (so your Sienna has the belt, NOT the chain). 2007-2008 model years has the timing chain.

From Toyota.com:ModelYearEngineBelt/Chain/Gear4Runner1990-2000,20104 CylinderChain1990-2002V6Belt2003-2010V6Chain2003-2009V8BeltAvalon1995-2003V6Belt2004-2011V6ChainCamry1990-2001AllBelt2002-20114 CylinderChain1990-2006V6Belt2007-2011V6ChainCamry Hybrid2007-20114 CylinderChainCelica1990-19994 CylinderBelt2000-20054 CylinderChainCorolla1990-19974 CylinderBelt1998-20104 CylinderChainCressida1990-1992L6BeltECHO2000-20054 CylinderChainFJ Cruiser2007-2010V6ChainHighlander2001-2008,20104 CylinderChain2001-2007V6Belt2008-2010V6ChainHighlander Hybrid2006-2010V6BeltLand Cruiser1990-1992L6Gear1993-1997L6Chain1998-2007V8Belt2008-2010V8ChainMR21990-19954 CylinderBeltMR2 Spyder2000-20054 CylinderChainMatrix2003-20104 CylinderChainPaseo1992-19974 CylinderBeltPrevia1991-19974 CylinderChainPrius2001-20104 CylinderChainRAV41996-20004 CylinderBelt2001-20104 CylinderChain2006-2010V6ChainSequoia2001-2007V8Belt20094.7 V8Belt20104.6 V8Chain20105.7 V8ChainSienna20114 CylinderChain1998-2006V6Belt2007-2011V6ChainSolara1999-20014 CylinderBelt2002-20084 CylinderChain1999-2009V6BeltSupra1990-1998L6BeltT1001993-19984 CylinderChain1993-1998V6BeltTacoma1995-20104 CylinderChain1995-2004V6Belt2005-2010V6ChainTercel1990-19984 CylinderBeltTruck1990-19954 CylinderChain1990-1995V6BeltTundra2000-2004V6Belt2005-2010V6Chain2000-20094.7 V8Belt20104.6 V8Chain2007-20105.7 V8ChainVenza2009-2010AllChainYaris2007-20104 CylinderChain
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