California Catalytic Converter Law
Check CARB Compliance, Verify EO Numbers & Understand 2024 Regulations
Vehicle Information Checker
Found stamped on the catalytic converter shell
Quick Reference
CARB States (2024)
California, Colorado, New York, Maine
CARB Required Years
Model years 1993, 1994, 1996 and newer
EPA Allowed Years
Model years 1992 and older
Warranty Requirement
5 years or 50,000 miles minimum
OBD II Threshold
Required for 1996+ vehicles
VIN Marking (2024 Law)
Required on all new converters sold
Important: Installing a converter based solely on physical fit is illegal in California. Always verify EO number compatibility.
2024 California Anti-Theft Laws
SB 55
Requires all new catalytic converters sold in California to be permanently marked with the vehicle's VIN number. Dealers cannot sell vehicles without VIN-marked converters.
Effective: January 1, 2024
AB 641
Makes it a misdemeanor to possess 9 or more used catalytic converters that have been cut from vehicles. Penalties include fines up to $1,000 per offense.
Effective: January 1, 2024
AB 1519
Prohibits removing, altering, or defacing VIN engravings on catalytic converters. Violations are classified as misdemeanors with significant penalties.
Effective: January 1, 2024
When to Use This Tool
Pre-Purchase Verification
Before buying an aftermarket catalytic converter, verify it meets CARB requirements for your specific vehicle. Avoid purchasing non-compliant parts that will fail smog checks and waste money.
Smog Check Preparation
Ensure your catalytic converter has a valid EO number before scheduling a smog check. Verify the EO matches your vehicle specifications to avoid inspection failures and unnecessary repairs.
Theft Recovery Compliance
After catalytic converter theft, use this tool to understand replacement requirements including VIN marking mandates under 2024 laws. Ensure your replacement meets all current legal standards.
Out-of-State Vehicle Registration
Moving to California from another state? Check if your current catalytic converter meets CARB standards. Many EPA-only converters are not legal in California and must be replaced.
Mechanic Shop Reference
Auto repair professionals can use this tool to quickly verify customer vehicle requirements, educate customers about CARB compliance, and select appropriate replacement converters for installations.
Legal Compliance Education
Stay informed about California's evolving catalytic converter regulations including 2024 anti-theft laws. Understand VIN marking requirements, possession limits, and installation restrictions.
Frequently Asked Questions
What is CARB compliance for catalytic converters?
CARB compliance means a catalytic converter meets California Air Resources Board standards. All aftermarket converters sold or installed in California must have a CARB Executive Order (EO) number, proving they passed emissions tests and will last 5 years or 50,000 miles. This requirement ensures converters maintain the same emission control performance as original equipment for California's strict air quality standards.
How do I find the Executive Order number on my catalytic converter?
The EO number is stamped or labeled on the catalytic converter shell. It must be at least 0.5 inches high and readable from 5 feet away. The label includes the EO number, specific part number (universal or direct-fit), and manufacturing date (month and year). Check the converter body or heat shield for this information. If the label is missing or illegible, the converter may not pass smog inspection.
What are California's 2024 catalytic converter theft laws?
California enacted three new laws in 2024 to combat catalytic converter theft. SB 55 requires VIN marking on all converters sold by dealers. AB 641 makes possessing 9 or more stolen converters a misdemeanor with fines up to $1,000 per offense. AB 1519 prohibits removing or altering VIN engravings. These laws address the epidemic of catalytic converter thefts that cost Californians millions annually.
Do I need a CARB or EPA compliant catalytic converter?
California-registered vehicles model year 1993, 1994, or 1996 and newer require CARB-compliant converters with valid Executive Orders. Model years 1992 and older can use EPA-compliant converters. Check your vehicle's emission control information label under the hood to determine if it's California or Federal emissions certified. CARB requirements also apply in Colorado, New York, and Maine as of 2024.
Is this California catalytic converter tool free to use?
Yes, this tool is completely free with no registration, subscriptions, or hidden fees required. Access instant CARB compliance information, EO number verification guidance, vehicle requirement analysis, and 2024 law updates without any cost. We provide this resource to help California drivers and mechanics navigate complex emissions regulations.
Can I install any catalytic converter that physically fits my vehicle?
No, it is illegal under California anti-tampering laws to install a converter based solely on physical fit. You must match the specific EO number to your vehicle's year, make, model, and engine family listed on the underhood emission label. Installing an incorrect converter, even if it physically fits, violates regulations and will cause smog check failure. Always verify EO compatibility before installation.
What happens if I fail a smog check due to my catalytic converter?
If your converter lacks a valid CARB EO number, doesn't match your vehicle specifications, or has been tampered with, you'll fail the visual inspection portion of the smog check. You must replace it with a properly approved and correctly matched converter to pass. Converters with withdrawn or rescinded EO numbers don't automatically fail but may require additional verification. Keep your EO documentation for inspection purposes.
Where can I find approved catalytic converters for my vehicle?
CARB maintains an official aftermarket catalytic converter database on their website at ww2.arb.ca.gov. Major manufacturers like Walker, MagnaFlow, and Eastern Catalytic also provide EO lookup tools on their websites. Licensed smog check stations and reputable auto parts retailers can help you find approved converters. Always verify the EO number matches your vehicle's engine family before purchasing.
No comments yet. Be the first to share your thoughts!