Introduction – The Surge in Keyless Theft
Home CCTV across the UK has captured ever‑faster relay thefts – some under 45 seconds. Understanding attacker tactics is the first step to beating them.
How a Relay Attack Works
- Signal boosting: Thief #1 stands near your house and amplifies the smart‑key signal.
- Signal relay: Thief #2 stands by the car with a second transceiver, fooling it into thinking the key is present.
- Drive‑away: Once the engine starts, most cars won’t shut off mid‑drive, giving criminals time to swap plates and disable tracking.
7 Proven Defences (Ranked)
| Rank | Defence | Effectiveness | Hassle |
|---|---|---|---|
| 1 | CAN‑bus Immobiliser | ★★★★★ | Low |
| 2 | RFID Deadlock / OBD‑Port Lock | ★★★★☆ | Medium |
| 3 | Motion‑sensing Faraday Pouch | ★★★★☆ | Low |
| 4 | Secure Drive‑Away Lockout | ★★★☆☆ | Medium |
| 5 | Steering Column Lock | ★★★☆☆ | Medium |
| 6 | Wheel Clamp | ★★☆☆☆ | High |
| 7 | CCTV & Smart Alarms | ★★☆☆☆ | Low |
Case Study – BMW X5, London 2024
A customer installed a CarGuard CAN Immobiliser after two attempted relay attacks. Police reports confirm the device prevented further theft attempts, saving £68 000 in potential loss.
FAQ – Frequently Asked Questions
Does keeping my key in the fridge block the signal?
Sometimes, but condensation can damage the fob. A tested Faraday pouch is safer.
Can thieves jam the lock signal instead?
Yes. Always listen for the lock clunk and mirrors folding; consider walk‑away auto‑lock functions.
Stay One Step Ahead of Thieves
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