What is a catalytic converter and why do people keep stealing them?

By Peter Valdes-Dapena | CNN

Johnny Wactor, an actor who formerly starred in “General Hospital,” caught people in the act of stealing the catalytic converter from his car Saturday. Tragically, one of the thieves, according to witnesses and Los Angeles police, then shot and killed Wactor.

It’s rare for someone to be murdered over a catalytic converter but thefts of this car part remain stunningly frequent. Last year, thieves stole 27,609 catalytic converters in the US, with more than half of those thefts happening in California, according to the National Insurance Crime Bureau. That’s down sharply from the more than 64,700 that were stolen in 2022. But, up to last year, catalytic converter thefts had been rising sharply, up by a factor of four, since 2020.

It might seem odd that this particular car part would attract so much criminal attention, especially one with such an innocuous purpose. A catalytic converter cleans a car’s exhaust, making the air safer to breathe for all of us. On its website, the US Environmental Protection Agency has called the catalytic converter “one of the great environmental inventions of all time.” But it’s not what the catalytic converter does that attracts desperate criminals. It’s what’s inside.

Often, there’s platinum, worth more than $1,000 an ounce, palladium, worth nearly as much, and rhodium, worth almost $5,000 per ounce. They react chemically with exhaust gases, breaking down compounds like carbon monoxide, nitrous oxides and small amounts of unburned fuel into less harmful substances.

A catalytic converter is a metal cylinder or flattened oval that’s part of the car’s exhaust system. It’s usually underneath the car with an exhaust pipe running in one end and out the other. Inside is a honeycomb-like structure coated in metals far more valuable than gold.

Easy to steal

Those metals, plus the catalytic converter’s exposed position, make it a target for theft. Also, unlike some other car parts, catalytic converters are usually not marked with a vehicle identification number, making it difficult to track a stolen converter back to an actual theft.

Unlike with other car parts that are under the hood, locking a car won’t necessarily deter a catalytic converter thief who can crawl underneath the car and saw through the exhaust pipe. The popularity of SUVs, which are higher off the ground, has made the job even easier.

But while those prices sound astoundingly high, they’re actually much lower than they’ve been in recent years. A couple of years ago, rhodium was worth almost $30,000 an ounce. That, plus increased law enforcement around these thefts and higher penalties for those who steal convertors or purchase stolen ones, contributed to recent declines in thefts, according the NICB.

Also, as car engines have becoming more efficient and cleaner-burning, catalytic converters have been made smaller and with less metal, said Richard Waitas, a senior manager at the exhaust components company MagnaFlow. There simply isn’t as much dirty exhaust gas they need to clean and this is one reason thieves may target older models.

Limiting thefts

Some newer cars have at least one catalytic converter – vehicles can have more than one – close to the engine where it works more efficiently because it stays hotter, said Waitas. That’s also helped deter some theft because the converter is just harder to reach up close to the engine block.

Federal legislation that is currently being considered would require catalytic converters to be marked with identifying numbers so stolen converters could be tracked back to specific cars, making the crime easier to prosecute. The National Automobile Dealers Association is actively pushing for the new law, the Preventing Auto Recycling Theft (PART) act, a spokesperson said.

Used catalytic converters can sell for anywhere from $25 to $1,000, depending on the metals content, which varies by a vehicles make and model, according to Scott Vollero and Christopher Gaines, who co-founded ScrapCATapp.com, an auction site for used catalytic converters.