You walk out to the car, start it, and it roars like a race truck. Someone crawled underneath overnight and cut the catalytic converter out. Now the car is loud, the repair estimate is coming, and you’re wondering whether it’s worth fixing at all.
If the answer is no, the car can still be scrapped. Here’s what changes.
What makes a converter valuable
A catalytic converter is part of the exhaust system that cleans up engine emissions. The reason it gets stolen, and the reason it moves a scrap offer, is what’s inside. Illinois law now defines a catalytic converter in the Vehicle Code (625 ILCS 5/1-110.05) and says it “includes nonferrous parts, including rhodium, platinum, and palladium.” Those are precious metals, and a converter’s value depends on how much of them that particular model carries.
So a car without its converter is missing its single most valuable small part. The steel, engine, wheels and everything else are still there and still worth their share. The offer drops by the converter’s share, not to zero. See how scrap car value works for how the parts add up.
Illinois rules on removed converters
Public Act 103-0677 tightened the rules effective January 1, 2025. Three parts matter to a seller:
- Detached converters. The Recyclable Metal Purchase Registration Law (815 ILCS 325/4.1) makes it a violation for any person to sell, or a dealer to buy, a catalytic converter or its contents “not attached to a motor vehicle at the time of the transaction,” unless the seller holds an automotive parts recycler or scrap processor license.
- Where a sale can happen. Under 815 ILCS 325/4.4, buying a used, detached converter is unlawful unless the buyer holds a recyclable metal dealer license and the sale takes place at that dealer’s fixed business address, with records kept.
- No cash for converters. The same section says a dealer “shall not pay cash” for a converter or its contents worth $100 or more.
For us that means a simple rule: we buy cars, and the converter goes with the car it’s bolted to. We don’t buy a converter on its own, at a curb or anywhere else. If someone offers to buy yours separately for cash, that’s the transaction the law was written to stop.
After a theft
- Report it. Call your local police department’s non-emergency line and file a report. Your insurer will want the report number.
- Talk to your insurer. Some policies cover theft damage. The repair estimate helps you decide whether fixing the car makes sense.
- Leave it parked. If you’re scrapping it anyway, there’s no reason to drive it anywhere. The tow is free.
- Decide. If the repair costs more than the car is worth to you, a scrap sale gets it out of the driveway in one visit.
Other parts thieves take
Converters are the big one, but stripped cars often lose wheels and batteries too. Each missing part takes its share off the offer, and the car is still a scrap car. Our page on stripped and incomplete cars covers those cases. And if you’re tempted to pull parts yourself before scrapping, read scrap it or sell it for parts first; the converter is the one to leave alone.