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Catalytic converter locks and alarms: Do they work?

We test an inexpensive device that claims to stop theft
Catalytic Converter Thefts
Posted at 5:00 AM, Aug 14, 2023
and last updated 2023-08-14 05:00:07-04

Thieves are increasingly targeting catalytic converters on cars.

If yours is stolen, replacing it could cost you thousands of dollars.

So are inexpensive alarms, locks and plates a solution to keep the crooks away from your car?

Lisa McNee would love to know: she is now among the tens of thousands of catalytic converter theft victims in the past year.

"The car was parked there, right in front of the house," she said, when her converter was recently stolen.

She provided us doorbell cam video which showed a shadowy figure pulling up to her car at night, leaving her with over a $1,000 repair bill.

Thieves steal catalytic converters, hoping for a big payday by melting down the precious metals inside.

CARFAX reports that as many as 153,000 were stolen in the year 2022.

Devices that might prevent theft

So what can you do? Several devices claim they help you deter a thief.

For about $200- $300, you can have a shop install a metal plate over your converter, making it very tough to steal.

But a lot of drivers don't want to pay that much.

So you'll find some cheaper options on Amazon.

You can purchases catalytic converter locking cables for around $150.

Or you can buy a simple motion sensor alarm for just $30.

We test one out

So, we ordered a $29 alarm and took it to Duebber's Auto Repair, where Marc Duebber agreed to install it.

He looked over the device, which you strap on to your car's exhaust pipe, with a small heat shield to keep it from melting.

He put batteries in the alarm and remote control, then put our Ford Escape up on a lift, and strapped on the alarm.

After setting the alarm with the provided remote, he gave the tailpipe a tap to test it out.

It worked. On the third light tap, a loud alarm sounded that could be heard throughout the repair shop.

Duebber, however, wonders if it's enough to scare away a thief.

"A determined thief," he said," would probably keep cutting and take the converter anyway."

But he admits a casual thief might run the moment the alarm went off.

Other things you can do, according to CARFAX:

  • Park in a well-lit area
  • Install motion sensor security lights outside your home to deter thieves
  • Ask a shop to etch your car's VIN on the converter

CARFAX's Editor in Chief Patrick Olsen told us "the VIN etching is great for police once they find a thief, but it doesn't often stop a thief."
For Lisa McNee, any of these protective devices are better than nothing.

"It's terrible people are out there doing this," she said.

So consider extra lighting, or a protective lock, or a simple alarm, and that way you don't waste your money.

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