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California State Laws Catalytic Converters
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List of aftermarket catalytic converters in compliance with  new regulations, effective January 1, 2009.  (PDF - 270K)   

Beginning July 10, 2008, no used converter can be legally advertised for sale, sold as replacement, or installed in California after this date.

The Air Resources Board's (ARB) California Evaluation Procedures for New Aftermarket Non-Original Equipment Catalytic Converters (California Procedures) were adopted by the Board on August 19, 1988. An interim procedure, Optional Evaluation Procedures for New Aftermarket Non-Original Equipment Catalytic Converters, was set up to address requirements specific to catalytic converters for vehicles equipped with on-board diagnostics II (OBD II) systems and went into effect on December 2001. These regulations require new aftermarket catalytic converters to comply with requirements of Title 13, California Code of Regulations (CCR) section 2222(h) in order to be exempted from California's anti-tampering law (Vehicle Code section 27156), thereby allowing them to be offered for sale, sold, installed or used in California.

The ARB adopted revised regulations and evaluation procedures in October 2007 for the approval of new aftermarket catalytic converters sold in California. The requirements apply to all new aftermarket converters produced for sale or sold in California after January 1, 2009. The requirements also sunset provisions allowing the sale of certified used catalytic converters beginning July 10, 2008. This means that no used converter can be legally advertised for sale, sold, or installed in California after this date.

To be updated on any future notices, mail-outs, and/or other documents drafted by ARB on this matter, please join the " aftermktcat" email list located here:

http://www.arb.ca.gov/listserv/listserv.php

(Select "All Lists" in the first pull-down menu, followed by entering your email address.  Click on the button "Display Email Lists & Archives." On the subsequent webpage, check the box for "aftermktcat," and click the send subscribe request button.)

The links below provide additional information for aftermarket catalytic converter retailers, installers, and consumers:

  • Aftermarket catalytic converters in compliance with the new regulations, effective January 1, 2009. (PDF - 270K)   
    • Click on the list's blue, underlined Executive Order numbers to view the applicable documents.  Please note that recently issued Executive Orders may not be available for immediate online viewing.  
    • Please note in the list the "See Inspection Alert" instructions for some of Walker Manufacturing Company’s (dba Tenneco) Executive Order labels. (PDF - 11K)
  • Questions and Answers. (PDF - 6K)
  • Understanding replacement converter labeling. (PDF - 44K)
  • Installer's checklist for new aftermarket catalytic converters. (PDF - 85K)

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