Losing your car to theft is a devastating experience. For Mercedes owners, especially those with keyless entry and start systems, the risk of relay attack thefts is a real concern. This article explores how these attacks work, how to protect yourself, and what to do if you need a New Mercedes Key Fob.
Understanding Relay Attacks and Keyless Car Theft
Relay attacks exploit the convenience of keyless entry systems. Thieves use two devices to extend the signal from your key fob to your car, tricking the car into thinking the key is nearby. This allows them to unlock and start the vehicle without ever physically possessing the key. This type of theft is quick, quiet, and often leaves no sign of forced entry. Typically, this involves one device near your home picking up the key fob signal and another near the car relaying it. The entire process can take less than 30 seconds. Once inside, thieves can use an OBD (On-Board Diagnostics) port to program a new key and disable yours.
Why are Mercedes Vehicles Targeted?
Mercedes vehicles, particularly those with keyless entry, are often targeted due to their high value and the perceived ease of theft using relay attacks. Models prior to mid-2019, which lacked motion sensor technology in the key fob, are particularly vulnerable. This sensor deactivates the keyless function when the key is stationary, making relay attacks much harder to execute.
Protecting Your Mercedes from Relay Attacks
Several preventative measures can significantly reduce your risk:
- Faraday Boxes/Wallets: These enclosures block the radio signals from your key fob, preventing thieves from amplifying them. Always store your keys, including spares, in a Faraday box when not in use. Test its effectiveness by trying to unlock your car with the key inside the box.
- Keyless Entry Deactivation: Many newer Mercedes models allow you to temporarily disable the keyless entry feature. Consult your owner’s manual for instructions on how to do this.
- Steering Wheel Locks: A physical steering wheel lock acts as a strong visual deterrent and makes it significantly more difficult for thieves to drive away even if they manage to gain entry.
- OBD Port Locks: These locks prevent unauthorized access to the OBD port, making it harder for thieves to program new keys.
- Park in a Garage or Well-Lit Area: While not foolproof, making your car less accessible can deter opportunistic thieves.
- Consider Aftermarket Security Systems: Explore aftermarket security systems that offer enhanced anti-theft features such as GPS tracking and immobilization.
What To Do If Your Mercedes Key is Stolen
If your Mercedes key is stolen or your car is stolen via a relay attack, take the following steps:
- Report the theft to the police immediately.
- Contact your insurance company to file a claim.
- If you have the Mercedes me app, use the “Stolen Vehicle Help” function to report the theft and potentially aid in locating your vehicle. This feature works in conjunction with law enforcement.
- Order a new Mercedes key fob from an authorized dealer or a reputable locksmith specializing in Mercedes keys. You’ll likely need proof of ownership and identification. This will disable your old key, preventing its further use.
Conclusion
Protecting your Mercedes from relay attacks requires proactive measures. While manufacturers are improving security features, utilizing Faraday protection, disabling keyless entry when possible, and considering additional security measures will significantly reduce your vulnerability to this increasingly common form of car theft. If you need a new Mercedes key fob due to theft or loss, contact an authorized dealer or specialized locksmith to ensure you receive a properly programmed and functional replacement.
