Quick Answer:
To prevent keyless car theft, store fobs in RFID-blocking Faraday bags, move keys away from exterior walls, and install OBD port locks. For commercial lots, combine AI-powered video surveillance with virtual guards to detect relay attacks and suspicious behavior in real-time before the vehicle is moved.
While 2024 and 2025 brought good news when it comes to the topic of car theft – both years saw massive drops in car theft from the immediate post-pandemic height, with 2023-24 having the largest single-year decline in 40 years — car theft remains a stubbornly common crime. Tech-driven theft, rather than smash-and-hotwire, is ever more popular with criminals, targeting models like the Tesla Model 3 and Model Y and the Hyundai Elantra and Sonata.
Luxury brands like Audi, BMW, Jaguar, Porsche, and Tesla are increasingly targeted, and a 2022 study revealed that keyless cars are actually twice as likely to be stolen as older vehicles with traditional keys.
But how do thieves steal cars with transponder keys?
If you’ve ever asked “can a keyless car be stolen?” – the answer is yes, faster and more quietly than you might think. Thieves no longer need to smash windows or hotwire ignitions. With inexpensive equipment and the right knowledge, they can unlock and start a keyless vehicle in under a minute, leaving no visible signs of forced entry.
Understanding how keyless vehicle theft works is the first step toward stopping it.
In the movies, it looks like it takes a couple of minutes for an experienced thief to smash a car window and hotwire a car. But experienced criminals are looking for opportunity, access, and an easy target.
Once cars began using electronic keys, criminals learned an easier method over the old smash and grab; just steal the key. Thieves can steal keys left in mounted lock boxes at car dealerships; unsecured keys can be grabbed off the wall, and enterprising criminals can break into boxes using a bolt cutter much more quickly than you’d think.
But, increasingly, they’re not needing to have the physical key at all.
Let’s look at all the issues of keyless car theft and how you can prevent it.
“If a thief has the right knowledge and equipment, modern cars can be incredibly easy to steal, and stealing them is actually getting easier rather than harder. The very technology that was supposed to make cars more secure is actually making life easier for criminals.”
How Keyless Entry Systems Work
Modern vehicles equipped with keyless ignition use radio frequency (RF) signals transmitted between the car and the key fob. When the fob is within a certain proximity, typically a couple of feet, the car unlocks and the engine starts without pressing a button.
This convenience is also the vulnerability. The problem isn’t with the locks or alarms themselves; it’s how easily the signal between fob and vehicle can be intercepted, extended, or cloned using tools that are cheap and widely available online.
The Trouble with “Keyless” Cars (That Have Transponder Keys)
What makes keyless car theft so dangerous is that it often doesn’t leave visible signs of forced entry, making it harder for insurance companies to verify that a theft occurred. Understanding how thieves steal key fob signals is essential for crafting a layered defense.
Today, thieves don’t have to overcome a lot of obstacles in the car itself to steal it. They can simply use the programmed signal from the car’s keyless entry fob. But how do they get that signal?
If the keys lack a signal-blocker shield (called an RFID blocker), thieves can use a transponder device, which you can pick up online on the cheap. That electronic device can capture the keyless entry code as it’s sent from the fob to the car. They can use that captured signal to open the car door with no alarm, start it, and drive away. It basically tricks the car into thinking the key is nearby. This technique is also known as key cloning. No matter what you call it, it’s an attractive way for criminals to take advantage of modern technology and turn it against us.
This technique has now evolved into something called “relay theft.”
Relay Attack Car Theft: How It Works
The relay attack is now the most common method thieves use to steal keyless cars, and it’s alarmingly simple. Two thieves work in coordination:
This is why understanding the answer to the question “how do thieves steal key fob signals” is so critical: they don’t steal the physical key. Rather, they steal the invisible signal it broadcasts. In high-turnover environments like dealerships, a relay attack can be executed and gone before anyone notices.
Signal Jamming
Some thieves use devices that emit radio signals to block communication between the fob and the car. When the owner presses the lock button, the signal is jammed and the car never actually locks. The owner walks away assuming everything is fine; the thief simply opens the unlocked door and gains access.
OBD Port Hacking
Some thieves exploit vulnerabilities in the car’s onboard diagnostic port (OBD port) to connect a programming device. By reprogramming a blank key fob, they gain access to the car and can start it with this duplicate key.
⚠️ Pro Tip: Secure Your OBD Port
Sophisticated thieves now use compact handheld devices — sometimes compared to “Game Boy”-style gadgets — that plug directly into a vehicle’s onboard diagnostic (OBD) port, typically located under the dashboard. Once plugged in, these devices can program a blank key fob to match the car’s immobilizer in a matter of seconds, granting full access and ignition capability.
Recommended solution: Install a physical OBD port lock. These inexpensive devices block access to the port entirely and can prevent this type of theft before it starts.
Immobilizer System Hacking
Another technique is to hack the car’s immobilizer system. Keyless cars use this system to prevent the engine from turning over without the correct electronic key. Skilled hackers can exploit vulnerabilities in the car’s immobilizer system software to bypass or disable this feature and start the vehicle.
When coupled with the expertise of serious, experienced criminals, car dealerships have a lot to worry about. Fortunately, there are a variety of methods to stop criminals in their tracks.
What Makes Commercial Lots a Prime Target for Keyless Entry Car Theft
Parking lots and auto dealerships face unique exposure to keyless entry car theft:
When it comes to thieves stealing keyless cars, commercial lots represent the highest-value, lowest-resistance targets available.
How to Prevent Keyless Car Theft
Making your vehicle or lot a harder target is always the first line of defense. If thieves assess the risk as too high, they’ll move on.
For Individual Vehicle Owners
Use RFID-blocking Faraday bags or pouches. These signal-blocking containers prevent your fob from broadcasting its signal when stored at home. Keep your fobs away from exterior walls and front doors, because the closer they are, the easier the relay attack becomes.
Key fob anti-theft options:
Add an OBD port lock. A physical lock on your OBD port removes one of the fastest-growing attack vectors entirely.
Use a steering wheel lock or wheel lock. These visible, physical deterrents signal to thieves that your vehicle will take time and noise to move, neither of which they want.
Park in well-lit areas and turn tires toward the curb when parked to make towing harder.
For Auto Dealerships and Commercial Lots
Some of the standard methods and tools for preventing theft at an auto dealership (keyless or otherwise) include:
See How Simple It Can Be To Secure Your Business.
How Modern Security Cameras Protect a Car Lot
Commercial-Grade Keyless Car Theft Prevention Measures
AI-Powered Video Surveillance
Virtual Security Guards
This combination of AI-powered detection and human response is what separates a passive security system from an active one.
GPS Tracking
When deployed together, these steps not only provide key fob theft protection but also strengthen overall lot security against both high-tech and low-tech threats.
A Layered Strategy Is the Only Reliable Defense
Keyless car theft is increasing because thieves are adapting faster than individual countermeasures can keep up. No single solution – not Faraday bags, not wheel locks, not cameras, not on-site guards – will fully prevent keyless entry car theft on its own.
The most effective key fob theft protection strategy layers multiple defenses:
As technology continues to evolve, so do the tactics used by those stealing keyless cars. Staying ahead means combining the best of physical deterrents with cutting-edge commercial surveillance, and treating keyless car security as an ongoing practice, rather than a one-time fix.
FAQ: Keyless Car Theft
Yes — in many cases, keyless cars are more vulnerable to relay attacks and signal interception, especially if the fob emits signals constantly. However, proactive security measures can mitigate the risk.
Thieves typically use a two-part relay system. One person captures the signal from the key fob inside your office or home, while the other relays it to the vehicle. The car thinks the fob is nearby and unlocks or starts.
Relay devices can capture signals from 30 to 50 feet away — sometimes even more if the signal is strong. This means your keys don't need to be near a door to be vulnerable.
A relay attack uses two signal-boosting devices to trick the vehicle into thinking the key fob is within range. It's one of the most common methods of keyless entry car theft today.
Many newer vehicles offer motion-sensitive fobs, time-limited signals, and encrypted communication. Still, adding physical deterrents like wheel locks and Faraday bags enhances keyless car theft prevention.
Yes — while no system is foolproof, combining digital safeguards with physical deterrents and signal-blocking solutions significantly reduces your risk.
