Last Updated on February 17, 2025 by Alan Weir
How to Protect Your Keyless Car from Relay Attack Devices
As a car locksmith with years of experience under my belt, I can’t stress enough how far technology has come in making our lives easier—and yet, how it has opened the door (no pun intended) to a whole new set of vulnerabilities, especially concerning keyless entry systems. These smart key technologies certainly have their perks, like convenience and automatic unlocking, but they also make your vehicle an appealing target for thieves wielding relay attack devices. If you find yourself wondering how to safeguard your prized possession, you’ve come to the right place.
What is a Relay Attack?
Before we dive into the tactics you can use to protect your vehicle, let’s clarify what a relay attack actually is. In simple terms, it’s a sophisticated method that allows thieves to unlock and start your car without having physical possession of your key fob. Here’s how it works:
Two criminals will typically work together. One stands near your house with a device designed to pick up the signal from your key fob, which sometimes could be sitting on a table or near your front door. The second criminal uses another device that transmits the signal to your car, tricking it into thinking that the key is nearby. It’s a great example of technology being both a boon and a bane.
Understanding Your Vehicle’s Technology
Before we jump into preventative measures, it helps to understand where the vulnerabilities lie. Most keyless entry systems operate on radio-frequency identification (RFID) technology. The signal emitted by your key fob isn’t very powerful and typically only has a range of a few meters. However, criminals can manipulate this distance, which is why understanding how your vehicle receives and transmits these signals is essential.
Now, let’s dig into the ways you can protect yourself from these relay attacks.
Use Faraday Pouches
One of the most effective and simplest methods of protecting your keyless entry system is to use a Faraday pouch. These specially designed bags are lined with metallic materials that block radio signals, effectively creating a "dead zone" for any potential relay devices. Simply place your key fob in this pouch whenever you’re home or not using it. It’s a small investment that pays dividends in peace of mind, knowing your key fob isn’t broadcasting its signal to anyone lurking nearby.
Invest in a Faraday Box
If you prefer a more home-centric solution, consider investing in a Faraday box, which serves the same purpose as a pouch but can be an attractive addition to your home décor. You can keep your key fob in this box when you’re not using it. Just like a pouch, it will block radio signals and help mitigate the risk of a relay attack.
Position Your Keys Farther Away
Another practical yet often overlooked solution is to be mindful of where you place your key fob when you’re at home. Don’t leave it near your front door or by a window. The farther you can get it from the entrance points of your house, the less likely it is to be picked up by any relay device outside. If possible, stow it in a drawer or even in a metal container as an added precaution.
Disable Keyless Entry When Not in Use
Many modern vehicles come with an option to disable the keyless entry and ignition functions through the vehicle’s settings. If you’re parked somewhere and don’t plan to use your car for a while, consider turning off this feature. Yes, it may require a few extra steps to get into your car, but the added security may be worth the trouble, especially if you’re parked in an unfamiliar area or overnight.
Use Security Systems
Engaging a secondary security system can significantly enhance your vehicle’s defences. Alarm systems, steering wheel locks, and immobilisers can act as deterrents for would-be thieves. A strong alarm system can alert you to any unwanted access attempts, while steering wheel locks make it physically challenging to drive off with your car. Don’t forget—most criminals prefer the easy targets, and visible security measures make your car less appealing.
Update Your Vehicle’s Software
Just like your smartphone or computer, keeping your car’s software updated is crucial. Many manufacturers regularly release updates to patch vulnerabilities in their keyless entry systems. Regularly check with your dealer to ensure your vehicle’s firmware and software are up to date. This proactive approach can make it significantly harder for criminals to exploit any weaknesses in your vehicle’s system.
Consider Physical Key Leverage
If your car model allows, carrying a traditional mechanical key can serve as a backup. While this might seem a bit old-fashioned, it gives you an alternative means of getting into your car and starting it without relying solely on the keyless entry system. Some vehicles offer a hidden physical key within the fob, which can be used in emergencies.
Be Aware of Your Surroundings
Situational awareness isn’t just for those working in security—it’s a life skill. When parking your vehicle, especially in public spaces or unfamiliar areas, be mindful of your surroundings. Look out for suspicious individuals who seem to be scanning for potential targets. If you suspect you’re being watched, don’t hesitate to change your plans, either by moving your car or delaying your activities.
Insurance Coverage Review
Lastly, consider reviewing your car insurance policy. It’s worth checking if your current plan covers theft from relay attacks, as more insurance providers are beginning to accommodate this risk. Upgrading your coverage could provide additional peace of mind, knowing you’ll be protected financially if all else fails.
Custom Solutions for High-End Vehicles
If you drive a luxury model, you may want to discuss custom solutions with an expert locksmith. These vehicles often come equipped with features that can be targeted by sophisticated relay attackers. There are various high-end security measures, such as biometric systems, GPS tracking, and even locking mechanisms that can help fortify your vehicle against stolen entry.
Educate Friends and Family
Finally, don’t keep this knowledge to yourself. Educate friends and family members about the risks of keyless entry systems and how they can protect their vehicles. It’s essential to create a community that’s aware and informed; a vigilant neighbourhood is a safer neighbourhood overall.
Being proactive about security is always better than being reactive. Implementing these measures will significantly reduce the chances of falling victim to a relay attack, giving you confidence and peace of mind as you hit the road. So, take these precautions seriously; your vehicle deserves it, and so do you.
Alan Weir – Master Locksmith with 30+ Years of Experience
Alan Weir is the founder of Weir Locksmiths and a Master Locksmith with over three decades of experience. Renowned for his expertise in home and automotive security, Alan has built a reputation for providing reliable and innovative locksmith solutions across the UK.
A certified member of the Master Locksmiths Association (MLA), Alan specialises in residential, commercial and automotive locksmith services including car key replacement, transponder programming, and advanced security systems. His dedication to the field has earned him thousands of satisfied customers and glowing reviews on platforms like Checkatrade.
Now contributing to RevLock, Alan shares his expert knowledge to all of RevLocks visitors.
