Keyless: Welche Automarken weiterhin auf unsichere Schlüsselsysteme setzen

Keyless access systems in numerous vehicle models remain a security risk, according to the ADAC's decade-long review of keyless tests. Nearly half of the examined cars can still be opened using an artificially extended radio signal, and around a third have had their engines started. The ADAC's database of test data now includes over 850 vehicles.

Overall, the situation has improved in recent years, with some manufacturers improving their systems and switching to the comparatively secure Ultra-Wide Band technology (UWB). The vehicle determines whether the key is truly nearby based on the signal timing, and prevents unauthorized access if the key is detected within close proximity.

However, other brands continue to use older systems that can be fooled with a relay attack, extending the radio connection between the vehicle and the key over hundreds of meters and through walls or doors. Once the engine is started, the car can usually be moved without the key's presence, until the fuel tank or drivetrain battery is depleted.

The ADAC particularly criticizes Aiways, Alfa Romeo, Alpine, BYD, Chevrolet, DS Automobiles, Fiat, Honda, Infiniti, Isuzu, Jeep, KGM/Ssangyong, Lynk&Co, MG, and Opel, stating that none of the tested vehicles from these brands were adequately protected. A metal can can shield the signal, and key fobs with built-in motion sensors are also unreliable, remaining vulnerable until their battery runs out.

Car owners with unprotected systems can check if the keyless function can be disabled via the vehicle's menu or instructions from the manufacturer. A shielded key fob case or a closed metal can can block the radio signal. The ADAC also advises consumers not to keep their keys near windows, exterior walls, or doorways, and to inquire about the use of secure UWB technology when purchasing a new vehicle. Experts recommend foregoing the convenience feature if there is any doubt.