Is a Penny in Your Car Door Handle a Sign of Danger? Experts Debunk This Persistent Urban Legend

1. Relay Attacks (Keyless Entry Theft)
Thieves use wireless signal amplifiers to capture the signal from your key fob—even if it’s inside your home—and relay it to your car. This tricks your vehicle into thinking the key is nearby and allows the doors to unlock.

Prevention Tip: Store your key fob in a signal-blocking pouch or metal container at night to disrupt relay signals.

2. CAN Injection Attacks
Some criminals are using advanced tools to tap into a car’s Controller Area Network (CAN) system, often through the headlights or exposed ports. Once inside, they can override the vehicle’s locking system and start the engine.

Prevention Tip: Use a steering wheel lock or physical security device to add an extra layer of deterrence.

3. Break-Ins via Window Smash
Sometimes, it’s not high-tech. A simple smash-and-grab is still among the most common ways thieves access cars—especially when valuables are left in plain sight.

Prevention Tip: Never leave phones, laptops, wallets, or bags in view. Always lock your doors, even when parked at home.

How to Respond If You Find Something Odd on Your Car
While finding a penny—or any other object—in your car’s door handle likely means nothing, it’s not wrong to be cautious.

If something feels off, here’s what you can do:

Inspect your car carefully, especially if you notice tampering, scratches, or unfamiliar items near entry points.
Check your locks manually and with your key fob to ensure they’re functioning correctly.
Document anything suspicious with photos, in case you need to report it later.
Report to authorities if you believe your vehicle has been tampered with or targeted.
But unless there are additional signs of criminal behavior—such as broken windows or forced entry—a penny in the door handle is probably just a misplaced coin or a prank.

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