Car thieves are becoming smarter every year, and one of the fastest-growing methods used across the UK is key fob signal boosting, also known as relay theft. If your car uses keyless entry or push-to-start, it could be at risk. The good news is that there are simple steps you can take to protect yourself.
In this guide, we’ll explain what signal boosting is, how to spot the signs, which cars are most at risk, and—most importantly—how to keep your vehicle safe.
What Is Key Fob Signal Boosting?
Key fob signal boosting is a technique used by thieves to trick your car into thinking your key is nearby. Here’s how it works:
- Thief One stands near your home with a signal amplifier device, capturing the signal from your key fob (often left inside the house near a door or window).
- Thief Two stands next to your vehicle with a receiver, which relays the signal to unlock and even start the engine.
This happens silently and within seconds, without the thieves ever touching your keys.
Signs You Might Have Been a Target
You may have been a victim of or targeted by a relay theft if:
- Your car was found unlocked but with no signs of forced entry.
- The alarm system was deactivated without damage.
- Items were taken from your vehicle but no windows were broken.
- Your CCTV or doorbell camera shows suspicious behaviour around your driveway at night.
Which Vehicles Are Most at Risk?
Relay theft mainly affects keyless entry and push-to-start vehicles. While premium brands such as BMW, Audi, Mercedes, and Range Rover are well-known targets, more affordable makes now also use the same keyless technology.
If your car unlocks when you approach it or starts with a button while the key is nearby, it could be vulnerable.
How to Protect Yourself from Signal Boosting
The good news is you don’t need to be a victim. Here are proven ways to block thieves:
- Faraday Pouch or Box: A simple, affordable case that blocks your fob’s signal when not in use.
- Switch Off Wireless Entry: Some vehicles allow you to disable keyless entry via the settings.
- Park Smart: Keep your car in a garage or park nose-in close to walls or fences.
- Visible Deterrents: Use a steering wheel lock—thieves hate wasting time.
- Home Security: Motion lights, alarms, and cameras discourage thieves.
- Install an Immobiliser: Advanced systems such as the Ghost II Autowatch, Scorpion X Can-Bus, or CanFantom Immobiliser make your car almost impossible to steal—even with a cloned or boosted key. (We supply and fit these across Surrey, West Sussex, South London, and Kent.)
What to Do if You Suspect a Relay Theft Attempt
- Contact a professional auto locksmith to check your keys and reprogram them if necessary.
- Report suspicious behaviour or attempted theft to the police.
- Consider upgrading your vehicle security with a modern immobiliser for peace of mind.
Conclusion
Relay theft is on the rise, but protecting your car doesn’t need to be complicated or expensive. With the right precautions and professional security upgrades, you can keep thieves at bay.
At 247 Auto Locksmith, we specialise in mobile key programming and advanced immobiliser installations. If you’re worried about car key fob signal boosting, contact us today—we’ll secure your vehicle quickly and effectively.
Call or WhatsApp us now on 07921 365 247
FAQs
Can thieves really steal my car without the key?
Yes. With relay theft, they don’t need your key in hand—they just extend the signal using special devices.
Do Faraday pouches actually work?
Yes. Quality Faraday pouches block the signal entirely, preventing thieves from capturing it.
What’s the best way to stop key fob signal boosting?
The most effective solution is combining a Faraday pouch with an aftermarket immobiliser like Ghost II.