Is it legal to buy a used catalytic converter? State laws as of 2026.
Buying a used catalytic converter is legal under federal law, but the seller must prove it came from a vehicle they owned. As of 2026, California, New York, Texas, Minnesota, Illinois, Oregon, and Washington require seller ID, VIN of origin, and recordkeeping. Possession of an unmarked or stolen converter is a felony in most of these states.
Federal rule (40 CFR § 85.1701–1716) requires that any catalytic converter sold for installation be EPA-certified for the specific vehicle, or — in California — CARB-certified. Used converters can satisfy this only if they came from a same-make, same-model, same-year vehicle and still meet the certification.
California (AB 1740, 2022) requires sellers to record the buyer's ID, vehicle VIN, and converter origin. Sales without VIN or proof-of-ownership documentation are illegal.
New York (S4154, 2024) mandates VIN engraving on every converter sold or installed, plus dealer recordkeeping for two years.
Texas (SB 224, 2023) makes knowing possession of a stolen converter a state-jail felony. Verified-purchase paperwork is the buyer's only defense.
Minnesota, Illinois, Oregon, and Washington have similar 2023–2025 laws requiring seller licensure, ID logs, and a 1–3 day hold period before resale.
Always ask the seller for the donor VIN, prior installation photos, and a written statement of origin. Save all documentation in case of later inquiry.
Frequently asked
Can I sell my old catalytic converter to a salvage yard?
Yes, if you can show proof of ownership of the vehicle it came from (title, registration, or bill of sale). Many states require the yard to log your ID and the donor VIN.
How do I know if a used converter is legal to install?
It must be EPA- or CARB-certified for the year, make, model, and engine of your vehicle. Check the converter for stamped certification numbers and cross-reference with the EPA's certified-converter database.
What if a converter has no markings at all?
Treat it as suspect. Unmarked converters are presumed stolen in California, Texas, and several other states. Do not buy.
Related guides
- How do I verify a VIN matches the title before buying?
- Salvage vs rebuilt vs clean vs junk title — what's the difference?