Aftermarket Catalytic Converter Database

This page last reviewed on June 27, 2016


The Air Resources Board, with assistance from aftermarket catalytic converter manufacturers, has been developing a database to store and retrieve information on aftermarket catalytic converters that have been approved for use in California.  These catalytic converters comply with the new regulations that became effective January 1, 2009.  The database is currently under construction and contains some of the catalytic converters approved for OBD II vehicles.  Once finalized, it will also include catalytic converters for non-OBD II vehicles.

Aftermarket Catalytic Converter Database*  (searchable by vehicle information or ARB Executive Order number)

                      NOTE: Windows Internet Explorer (IE) users, encountering database display issues, should check the
                                 Compatibility View, in the IE Address Bar.

*Alert: Please view Executive Orders that were rescinded or withdraw and the catalytic converters that cannot be installed, sold, offered for sale or advertised.

*Toyota: Please follow this link to see catalytic converters that are legal on 2001-2004 4.7 liter Toyota Sequoia and 2003-2004 4.7 liter Toyota Tundra.

To access Executive Orders that are not shown in the database, please view the complete list of approved catalytic converters under the new regulations.  Also, to access Executive Orders for only pre-OBD II vehicles under the new regulations please view the Pre-OBD II EO Listing.


For information on Executive Orders issued under the old regulations, view the summary list.  All Executive Orders on this summary list are void and no longer in force and effect.  The catalytic converters they cover cannot be sold in California effective December 31, 2008.  Likewise, the used catalytic converters they covered cannot be sold in California effective July 10, 2008.


Please note that the database and lists are applicable to passenger cars, light-duty trucks, and medium-duty vehicles only.  Executive Orders for motorcycle aftermarket catalytic converters can be viewed in the Motorcycle Aftermarket Parts Page.


If you have any questions, please contact ARB's Public Information Helpline at (800) 242-4450 or via email.




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