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How to Protect Your Car Key Fob from Relay Attacks

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25.04.2025

Car theft has entered the digital age — and unfortunately, so have the thieves. As car manufacturers move toward keyless technology, a new type of threat has emerged: the relay attack. Unlike traditional break-ins, this high-tech method allows criminals to steal a vehicle without touching the keys — or even breaking a window.

Imagine this: your car is parked safely outside your house. Your key fob is inside, hanging on a hook by the front door. You're fast asleep. But outside, two individuals with small electronic devices are working together. One stands near your front door, scanning for a signal from your key fob. The other waits by your car. Within seconds, your key’s signal is captured, extended, and transmitted to your car. It unlocks, starts, and drives away — and you might not notice until morning.

This is not science fiction. It's called a relay attack, and it's one of the fastest-growing vehicle theft methods worldwide.

Why Relay Attacks Are So Effective

The key to this technique is exploiting the constant communication between your car and its fob. Most keyless entry systems are designed for convenience — you don’t even need to press a button. The car automatically detects the presence of the key fob and unlocks when you approach.

This convenience is exactly what makes it vulnerable. Relay devices — which are cheap, portable, and easy to use — can mimic the signal and trick the car into thinking the key is nearby, even when it’s inside your home.

Security experts have raised the alarm about this method for years, but many drivers still don’t realize how easily their vehicles can be accessed. In the UK alone, keyless car theft now accounts for more than 90% of vehicle thefts involving high-end models, according to the AA. And with the rise of online tutorials and black-market tools, the problem is growing globally.

So, What Can You Do to Stay Safe?

Fortunately, protecting your vehicle doesn’t require advanced tech or a huge investment — just awareness and a few smart habits.

One of the most effective ways to block relay attacks is also the simplest: store your keys in a signal-blocking container. Often called a Faraday pouch or Faraday box, this lined case prevents radio signals from escaping. When your keys are stored inside, they can’t be scanned or cloned, no matter how close a thief gets to your home.

Placement also matters. Many drivers leave their keys near the front door or on an entryway table — spots that are easy to access from outside. Moving your keys to the center of your home, an upper floor, or even a metal box can reduce signal exposure dramatically.

Some newer key fobs allow you to manually disable the signal when it’s not in use. This feature is often hidden in the manual and rarely mentioned by dealers. Taking a moment to learn whether your key supports this — and how to activate it — can make a big difference.

It’s also worth checking whether your vehicle’s software is up to date. Many automakers periodically release firmware updates that strengthen encryption or reduce signal range. In some cases, updates can even detect and block suspicious unlock attempts.

And while it may seem old-fashioned, physical security still works. Devices like steering wheel locks or gear shift immobilisers can be powerful visual deterrents. Even if a thief manages to unlock your vehicle, the sight of a bulky lock inside may be enough to send them looking for an easier target.

If you're looking for practical solutions beyond GPS, check out our blog: Do Car Keys Have GPS? What You Need to Know About Key Tracking.

In summary, here are a few key takeaways to keep your keys and vehicle safer:

Store your fob in a signal-blocking pouch or metal container

Keep keys away from entry points like doors or windows

Disable keyless signals if your fob supports it

Update your car’s firmware regularly

Use visible anti-theft devices as a deterrent

Looking Ahead: Smarter Cars, Smarter Drivers

Relay attacks are part of a larger trend — one where modern technology makes life more convenient, but also creates new risks. Just like we’ve learned to secure our phones and passwords, we now need to think about how we secure our vehicles.

As carmakers explore more secure solutions — like Ultra Wideband (UWB) tech and biometric verification — drivers still need to take responsibility for their vehicle’s safety. The tools are already out there, and many of them cost less than a meal out. It’s not just about avoiding theft; it’s about peace of mind.

So next time you get home, before tossing your keys on the hallway table, take a second to think: are they really safe there?

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Anti-glare & oleophobic coatings Many navigation screen protectors include a matte, anti-glare surface. This scatters harsh sunlight and helps repel fingerprints and oil. (Some even advertise oleophobic layers that resist smudges.) Installation matters Follow the instructions carefully (clean the screen first, align the film, and smooth out bubbles). A misaligned or bubbled protector can itself cause visibility issues. Installing a car screen protector isn’t just about preventing scratches. It also helps maintain screen clarity over time. As one Tesla owner discovered, adding a new glass protector made even a worn, glare-prone screen “look almost new again” If you’ve already chosen a hydrogel protector and want to install it correctly, follow our step-by-step guide on how to install a hydrogel navigation screen protector . Clean Your Screen the Right Way Fingerprints, dust and grease are everyday enemies of visibility. But cleaning improperly can do more harm than good. Follow these expert tips: Use a microfiber cloth Wipe the screen with a soft, clean microfiber towel – even better if it’s dedicated just to your screen . This gentle fabric removes oils without scratching the glass. Spray cleaner on the cloth, not the screen If you need liquid cleaning, lightly mist it onto the cloth first. Never spray cleaners or water directly onto the touchscreen . Too much liquid or harsh chemicals can seep into seams or damage any oleophobic coatings. Avoid household glass cleaners Standard window cleaners (with ammonia or alcohol) can strip away protective coatings or damage the display . In fact, Car and Driver cautions that you should “avoid using household glass cleaner on your car’s touchscreen” unless you know it’s ammonia- and alcohol-free . Use fresh wipes Always use a clean side of your cloth or a new wipe on the screen. AGWS (an auto insurer) advises against using a cloth or wipe that’s already been on the dashboard or door panels – it can transfer grit and actually scratch the display Detail with precision If dirt or fingerprints linger, dampen the cloth with plain water or a gentle, screen-safe cleaner and buff in small circles. For stubborn spots, a second dry pass with the microfiber cloth will remove streaks. Wipe smudges away with a soft cloth – spraying cleaner on the cloth, not on the screen . Clean your screen each time you wash the car, or whenever you notice foggy patches. In fact, one test found that many “interior detailer” sprays (like Chemical Guys or Meguiar’s) can work just as well as specialized screen cleaners if they’re labeled safe for screens. Reduce Sunlight Glare Glare is one of the biggest complaints with modern car touchscreens. It makes maps hard to read, increases eye strain, and leads to drivers pressing harder on the display—over time, this causes wear and visible marks. To reduce glare: Install a matte hydrogel screen protector Adjust the display’s brightness and contrast Avoid cleaning with shiny or oily cloths Park with the dashboard away from intense sunlight when possible Hydrogel films help significantly because they diffuse harsh reflections without dulling the screen. Prevent Fingerprints and Smudges Touchscreens are fingerprint magnets. Oils from your hands quickly accumulate on the surface, especially on climate controls or zoom gestures. Solutions that actually work: Oleophobic coatings (built into many hydrogel protectors) Regular microfiber wipe-downs Avoid touching the screen with sunscreen or lotion on your hands Use voice commands for common actions when possible Drivers notice a big difference after installing a car navi screen protector—much fewer smudges and much easier cleaning. Protect the Screen During Everyday Use Small habits reduce long-term wear: Remove rings before using the touchscreen Don’t store hard objects (keys, coins) near the display Keep dust off the dashboard Avoid pressing with fingernails Use steering-wheel controls when possible Tiny scratches add up, especially on softer automotive materials. FAQ What is the best way to protect a car navigation screen? Installing a car-specific hydrogel screen protector provides the best protection against scratches, glare and fingerprints. Do hydrogel protectors really self-heal? Yes. The top layer softens slightly with heat and pressure, allowing micro-scratches to fade within minutes. Do these protectors affect touch sensitivity? No. Hydrogel films are extremely thin and designed to preserve the original touchscreen response. Can I install a screen protector myself? Hydrogel films are easy to install because they are flexible and bubble-resistant. Most people complete the installation in minutes. Will a protector reduce screen brightness? A high-quality hydrogel film maintains screen clarity while reducing harsh glare. Do car manufacturers recommend screen protectors? Many dealerships now advise using some form of screen protection due to rising replacement costs and increasing touchscreen sizes. Which Cars Benefit Most Some car brands benefit disproportionately from hydrogel screen protection — especially large-format touchscreens in premium models. If you want the full breakdown of the top models for 2025–2026, see our detailed guide on which cars benefit most from hydrogel navigation protection . To protect your own car’s screen from scratches, glare and fingerprints, visit our shop at mr-key.com . Related Guides How to Install a Hydrogel Navigation Screen Protector Which Cars Benefit Most From Hydrogel Navigation Protection? (2026 Overview) Hydrogel vs Tempered Glass Navigation Protectors Comparison

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