Catalytic converter theft: why converters get stolen, how to deter it, and how auto comprehensive insurance usually responds

Short answer: Catalytic converters contain precious metals that make them a target. California's Bureau of Automotive Repair says experienced thieves can remove one in one to two minutes, pocket hundreds at a scrapyard, and leave you with a thousands-of-dollars repair (BAR). A federal case unsealed by the Justice Department involved a multi-state ring that resold stolen converters for more than $600 million (DOJ). If you carry comprehensive coverage on the vehicle, theft of a permanently installed part is generally an auto comprehensive claim, subject to your deductible (NAIC; Michigan DIFS). Park in a garage when you can, and ask a licensed shop about shields, straps, VIN etching and alarm sensitivity (CARB; BAR).

This guide applies in all 50 states. It is based on U.S. Department of Justice charging materials, California Bureau of Automotive Repair and California Air Resources Board consumer guidance, and Michigan Department of Insurance and Financial Services consumer advice, checked in October 2026. Replacement and emissions rules vary by state; California Smog Check details below are California-specific examples.

Why converters get stolen

A catalytic converter sits in the exhaust path and uses rare metals to turn smog-forming pollutants into less harmful compounds (BAR; CARB). Those metals — palladium, platinum and rhodium — have high recycle value. CARB's February 2024 fact sheet notes rhodium can cost upwards of $15,000 an ounce, which is why organized theft rings chase the parts (CARB).

Michigan's insurance regulator, citing National Insurance Crime Bureau figures, reported 14,433 converters stolen nationwide in 2020, up from 3,389 in 2019 and 1,298 in 2018 (Michigan DIFS). CARB separately described a four-fold jump in monthly thefts tracked by the NICB and a more than 300% increase reported by the Los Angeles Police Department from 2019 to 2020 (CARB). The Justice Department has prosecuted multi-state enterprises: in one Northern District of Oklahoma case, the leader of a ring admitted reselling stolen converters to a metal refinery for more than $600 million, with search warrants executed in Oklahoma, Texas, California, New Jersey and New York (DOJ).

What a theft looks like (and costs)

• Speed. BAR says experienced thieves need only one to two minutes and basic tools (BAR).
• Payoff for the thief vs. cost to you. What nets a thief hundreds at a scrapyard can cost the owner thousands to replace, depending on make and model (BAR).
• Collateral damage. Cutting the converter can damage nearby exhaust components; CARB advises having a trusted mechanic inspect those parts before you replace the converter (CARB).

If you catch a theft in progress, call the police — do not confront the thief (CARB). After a theft, contact law enforcement and your insurer (CARB; Michigan DIFS).

Deterrence steps from state agencies

CARB, BAR and Michigan DIFS publish overlapping prevention lists (CARB; BAR; Michigan DIFS):

1. Park in a garage when you can. CARB calls that the best single deterrent (CARB).
2. Protective plate, shield, clamp, cage or strap. Have a licensed shop install it so the device does not damage the converter or hide required markings. BAR says the device should not be welded or attached directly to the converter (BAR).
3. VIN or plate etching / engraving, plus optional bright heat-resistant paint that does not cover identifying marks. Many agencies and shops run free etching events (BAR; CARB).
4. Alarm sensitivity. Recalibrate for vibration so cutting or jacking triggers the alarm; some systems monitor the converter itself (BAR; CARB).
5. Lighting and cameras. Motion-sensor lights and cameras over a driveway raise the chance a thief is seen (CARB; Michigan DIFS).
6. Public parking. Prefer well-lit, high-traffic spots near building entrances (BAR).

In California, a poorly installed theft-prevention device can cause a Smog Check failure if it modifies or damages the converter or hides required identifying information (BAR).

Replacement and emissions rules (California example)

BAR's guidance for California owners (BAR):

• Replace the converter as soon as possible to avoid further vehicle damage, and before the next Smog Check.
• Use an OEM converter or a CARB-approved aftermarket unit with an Executive Order (EO) number that matches your vehicle.
• Have installation done at a licensed Smog Check station; BAR's Consumer Assistance Program does not pay for stolen-converter replacement.

Other states have their own inspection and aftermarket rules. Ask a licensed shop in your state what is legal for your vehicle.

How auto insurance usually responds

Comprehensive, not collision. The NAIC describes comprehensive as coverage for damage to your car that is not caused by a collision — including theft, hail, windstorm, flood, fire and hitting animals (NAIC). A catalytic converter is a permanently installed vehicle part, so theft is typically handled as an auto comprehensive claim when you carry that coverage (Michigan DIFS). That is different from a laptop stolen from the cabin, which is usually a homeowners or renters personal-property claim — see theft from a car.

Deductible and limits. You still owe your comprehensive deductible (Texas Department of Insurance; Michigan DIFS). If the repair cost is close to the deductible, filing may not be worthwhile. Michigan DIFS also warns that the expensive damage from this crime may not be covered if you do not carry comprehensive — liability-only policies do not pay for your own parts (Michigan DIFS).

What to do after a theft.

1. Call law enforcement and get a report number (insurers usually require one for theft claims).
2. Call your insurer or agent and ask what comprehensive pays for on your specific policy (BAR; Michigan DIFS).
3. Have a licensed shop inspect related exhaust damage before ordering a replacement (CARB).
4. In California, use a licensed Smog Check station and a legal OEM or EO-numbered aftermarket converter (BAR).

Premium afterward. A comprehensive claim can affect your renewal rating under the insurer's rules and your state's surcharge laws. Ask before you file if the claim is near your deductible. For not-at-fault situations involving another driver, see not-at-fault accident surcharge rules by state — converter theft by a stranger is a first-party comprehensive loss, not that framework.

CARB mentions specialty "catalytic converter theft insurance" products in some markets (CARB). Those are optional products, not a substitute for understanding your auto comprehensive deductible and limits.

Related reading: what car insurance do I need and the state insurance rules hub.

Frequently asked questions

Alishahi Insurance · 439 N Canon Dr, Penthouse, Beverly Hills, CA 90210 · (877) 711-4545 · CA License #4348151. General information only. This isn't legal, tax or financial advice or a coverage determination. Coverage depends on policy language and underwriting, and rules vary by state.