Selling a used catalytic converter in California is legal, but only if you can document that you own the vehicle it came from and the converter carries a VIN that matches your title or registration. Two statutes control the transaction: Vehicle Code 10852.5 restricts who a recycler is allowed to buy from, and Business and Professions Code 21610 dictates how the recycler must record the sale and pay you. Between them, a private sale involves more paperwork, and more delay, than most people expect.
Who California Lets Sell a Used Converter
Vehicle Code 10852.5 makes it unlawful to purchase a used catalytic converter unless the seller falls into one of six categories. The statute is written as a rule for buyers, but the practical effect is a rule for sellers: a law-abiding recycler won’t accept a converter from anyone outside those categories.1California Legislative Information. California Code Vehicle Code VEH 10852.5
The authorized sellers are licensed auto dismantlers, core recyclers with a fixed place of business, licensed motor vehicle dealers and lessor-retailers, licensed automotive repair shops, other businesses whose licenses reasonably generate used converters through normal operations, and individual vehicle owners who can document lawful ownership. Most private sellers fall into that last category, and it’s the one with the strictest documentation requirement.
What an Individual Seller Has to Bring
If you’re selling a converter that came off your own vehicle, the recycler is required to verify your ownership before paying you. You’ll need to produce a certificate of title or a vehicle registration that identifies you as the legal or registered owner. The VIN on that document has to match a VIN that is permanently marked on the exterior case of the converter itself.1California Legislative Information. California Code Vehicle Code VEH 10852.5
“Permanently marked” is defined by statute. It means engraved, etched, welded, metal stamped, acid marked, or displayed by a similarly reliable method on the converter’s outer case. A handwritten label or a sticker will not satisfy the check.
The VIN-Marking Problem
Vehicle Code 24020, added by Senate Bill 55, requires dealers to permanently mark the VIN on the catalytic converter of any new or used vehicle they sell. That builds the verification chain the recycler is later required to run.2California Legislative Information. California Senate Bill 55 – Vehicles: Catalytic Converters
If your car was sold before that requirement took effect, or you bought it from a source exempt from it (collector vehicles, motorcycles, wholesale auctions, salvage pools, and dismantler sales are all excluded), your converter may never have been engraved. A buyer can also decline the dealer’s offer to mark it at sale. Without a VIN on the case, a recycler has no way to run the match that Vehicle Code 10852.5 tells them to run, and the honest ones will turn you away. Aftermarket engraving services exist, and some law enforcement agencies host free VIN-etching events; either way, the marking has to happen before you try to sell.
How You Get Paid
Cash is off the table. California prohibits core recyclers from paying cash for catalytic converters. Every payment has to move through a traceable method: check, credit card, or an equivalent.2California Legislative Information. California Senate Bill 55 – Vehicles: Catalytic Converters
Timing depends on who you are. A commercial enterprise can receive payment on the spot by check, debit, or credit card. An individual seller cannot. The recycler has to either mail your payment to your address or hold it for you to collect on the third business day after the sale. The delay is the point. It’s designed to make quick-cash converter theft impractical, since a thief has to give a real address or come back three days later.2California Legislative Information. California Senate Bill 55 – Vehicles: Catalytic Converters
What the Recycler Will Record
Business and Professions Code 21610 requires the recycler to create a written record of every converter transaction and keep it for at least two years, available to law enforcement on request.3California Legislative Information. California Code Business and Professions Code BPC 21610
From an individual seller, the recycler must record your name, your valid driver’s license number and the state that issued it (or your California ID number), and the license plate of the vehicle you drove to the yard. From a business, the record instead includes the business name, physical address, phone number, and either the business license number or tax ID.3California Legislative Information. California Code Business and Professions Code BPC 21610
Every transaction record also has to include the date and location of the sale, a description of the converters (type, quantity, and any identification number), the amount paid, and the year, make, model, and VIN of the vehicle the converter came off. You’ll be asked to sign a statement confirming you own the converter, or identifying the person you got it from. Depending on the circumstances, the recycler may ask to see a copy of the vehicle’s title.3California Legislative Information. California Code Business and Professions Code BPC 21610
Showing up with a converter and no paperwork is a wasted trip. The recycler isn’t being cautious; they’re following a statute that carries misdemeanor liability, escalating fines, and, on a third conviction, a mandatory one-year shutdown of their business.3California Legislative Information. California Code Business and Professions Code BPC 21610
What Happens If a Buyer Skips the Rules
The reason recyclers are strict is that buying from an unauthorized seller is itself a violation. Under Vehicle Code 10852.5, purchasing a used catalytic converter from someone outside the six authorized categories is an infraction. Fines run $1,000 for a first offense, $2,000 for a second, and $4,000 for a third or subsequent offense. No jail time attaches, but the penalties climb quickly for what might look like a small scrap deal.1California Legislative Information. California Code Vehicle Code VEH 10852.5
If a recycler falsifies a record or skips the payment or verification rules under Business and Professions Code 21610, that’s a misdemeanor, with fines that match the infraction ladder and, at the second conviction, a possible 30-day shutdown; at the third, a mandatory shutdown of at least one year.3California Legislative Information. California Code Business and Professions Code BPC 21610
A Note on Converters That Aren’t Yours
These rules govern legitimate sales. Selling a converter you took off someone else’s vehicle is a separate problem, and a much more serious one. Removing a vehicle part without the owner’s consent violates Vehicle Code 10852.4California Legislative Information. California Code Vehicle Code VEH 10852 Because a single converter often carries hundreds to over a thousand dollars in platinum, palladium, and rhodium, the theft itself typically charges as grand theft under Penal Code 487, and possession of a converter suspected to be stolen can bring a receiving-stolen-property charge under Penal Code 496. Prosecutors routinely stack the counts.
For a private sale to go through cleanly in California, then, three things have to line up: you own the vehicle the converter came from, the VIN is engraved on the case and matches your title or registration, and you’re prepared to wait a few days for a check. Missing any one of them, and the transaction stops at the counter.