Debunking the Most Common (and Misleading) Tips About Preventing Catalytic Converter Theft
You’ve probably seen articles and posts listing 5–7 ways to prevent catalytic converter theft. These tips get shared often—but do they actually work? Let's break them down.
“Etch your VIN or license plate onto your catalytic converter.”
MYTH
Etching does nothing to stop theft. It may help identify your converter after it's stolen—if it's ever recovered, which is rare. Thieves don’t check for markings before cutting, and those markings are easy to remove.
Miller CAT Recommendation:
Etching won’t hurt, but don’t count on it to protect your vehicle. Many shops offer free or paid etching services, but this only helps after your converter is gone. If you do get it etched, pair it with a proper shield for real protection.
“Spray your catalytic converter with high-temperature paint.”
MYTH
Paint won't stop a thief. It's only useful for law enforcement trying to trace stolen parts—but even then, it's unreliable. Plus, converters can reach over 1,200°F, which most paints can’t withstand. A painted converter may even draw more attention.
Miller CAT Recommendation:
Skip the paint. It doesn’t deter theft, and in some cases, it might actually help thieves identify the part.
“Just park in a well-lit area with cameras.”
MYTH
Thieves aren’t afraid of lights or cameras. Many thefts happen in broad daylight or busy parking lots, even with cameras rolling. Most are in and out in under 2 minutes.
Miller CAT Recommendation:
While lights and cameras may help with evidence after the theft, they won’t prevent it. Don’t rely on your parking spot for protection.
“Install a car alarm or motion sensor.”
MYTH
Alarms rarely stop converter theft. Most people ignore them, and many thefts happen so fast that the alarm is useless by the time anyone notices. High-clearance vehicles are especially vulnerable because alarms are less likely to detect movement underneath.
Miller CAT Recommendation:
If you're choosing between an alarm or a shield, choose the shield. Alarms are better suited for thefts that take time—converter theft isn't one of them.
“Install a shield or protective plate.”
TRUTH
Shields are the most effective way to prevent catalytic converter theft. A properly designed shield makes it much harder and more time-consuming for thieves, which significantly reduces the chance they’ll even try.
Miller CAT Recommendation:
Our Cat Shields are trusted by hundreds of thousands of drivers—with a theft rate of less than 0.01%. But not all shields are created equal. Avoid products that require drilling into your car, have poor fitment, or use ineffective materials like wire straps or rebar (which can damage your converter and may be illegal in some states).
Want a second opinion? Even Donut Media recommends our shields.
There’s a lot of outdated and misleading advice out there. We hope this clears things up so you can make informed, confident decisions to protect your vehicle and your peace of mind. Join the thousands who sleep better at night and park wherever they want—without worrying about catalytic converter theft.
