can new cars be stolen without keys

[Peter]

Yes, modern cars equipped with keyless entry and start systems can absolutely be stolen without physical keys. While keyless ignition (also known as a key fob or smart key system) was designed to enhance convenience and security, it has introduced new vulnerabilities that thieves exploit using sophisticated electronic methods. The primary threats are relay attacks, signal jamming, and key programming theft, not physical lock picking.

The most common technique is the relay attack. Key fobs constantly emit a low-frequency signal that the car detects to unlock and start when the fob is nearby. Thieves use one device to amplify the fob's signal from inside your house (even if the fob is far from the door) and a second device near the car to trick it into thinking the key is present. The entire process can take less than a minute.

Another method involves on-board diagnostic (OBD) port programming. Thieves gain entry to the vehicle (sometimes by simply smashing a window) and plug a device into the OBD-II port, which is standard in all cars sold in the US since 1996. This allows them to program a blank key fob on the spot, effectively giving them a new "key" to drive away.

Theft Method	How It Works	Vulnerable Vehicles	Estimated Theft Time
Relay Attack	Amplifies the key fob's signal from inside a home to the car.	Most cars with keyless entry/start.	30-60 seconds
OBD Port Hack	Programs a new key via the car's diagnostic port after gaining entry.	Wide range of vehicles, often targeted by model.	5-10 minutes
Signal Jamming	Blocks the lock signal from your fob, leaving the car unlocked.	All key fob systems.	Instant (prevents locking)
GPS Signal Spoofing	Overrides the vehicle's telematics to prevent tracking (for high-end thefts).	Luxury vehicles with tracking systems.	Varies

To protect your vehicle, use a Faraday pouch or signal-blocking bag to store your key fobs at home, which prevents relay attacks. Consider a steering wheel lock or an OBD port lock as a strong physical deterrent. Always manually check that your car is locked by pulling the handle after using the fob, and avoid leaving key fobs near your front door or in the car overnight.

[LaReese]

It's a scary reality. Thieves don't need your keys anymore; they just need to be close to where you leave them. If your key fob is near your front door, they can use a cheap relay device to copy its signal to your car parked outside. My neighbor had his SUV stolen from his driveway in under two minutes. Now, I keep my keys in a metal box at night. A simple steering wheel lock is also a great visual deterrent that makes thieves move on to an easier target.

[SanAdelyn]

From a technical standpoint, yes. Keyless systems rely on wireless communication, which can be intercepted. The primary weakness is the constant "handshake" signal between the car and the fob. Thieves exploit this with relay devices that extend the fob's range. The car's security system sees a valid key and allows access and ignition. There's also a risk from the OBD-II port, which can be used to program a new key if physical access to the interior is gained. Security is an ongoing battle between manufacturers and criminals.

[VonLilah]

I was skeptical until I saw the videos online. It looks like magic, but it's just tech. Two guys walk up to a house with a little antenna, another stands by a nice car. A few seconds later, the car unlocks and they drive off. No broken glass, no alarm. It’s called a relay attack. It made me realize that my key fob isn't just a key; it's a radio. Now, I wrap mine in aluminum foil when I get home. It sounds silly, but it blocks the signal completely. Best free security upgrade ever.

[GenevieveRose]

Absolutely. The convenience of keyless entry comes with a trade-off. The most effective thefts are silent and electronic. Beyond relay attacks, there's a significant risk from the car's own diagnostic system. Thieves can break a small window, plug a device into the OBD port under the dashboard, and program a new key fob in minutes. This is why a layered defense is crucial. Combine signal-blocking for your fob with a physical barrier like a steering wheel lock. This "virtual + physical" approach significantly raises the effort required, making your car a less appealing target.