Whether the FBS4 (Drive Authorization System 4) used in Mercedes-Benz vehicles will be “cracked” for locksmiths is a complex question that depends on several factors, including technological advancements, security measures, and the efforts of both legitimate locksmiths and aftermarket tool developers. As of February 20, 2025, here’s what can be said based on available information and trends:
FBS4, introduced around 2013–2014 in Mercedes models like the W205, W222, and others, represents a significant leap in security over its predecessor, FBS3. It uses advanced encryption and tightly integrates with the vehicle’s electronic control units (ECUs), making it far more resistant to unauthorized key programming. Unlike FBS3, which has been successfully bypassed by various aftermarket tools (e.g., VVDI MB, CGDI MB), FBS4 has remained largely uncracked for locksmiths outside of official Mercedes-Benz channels. This is primarily due to its sophisticated cryptography and the requirement for online authorization through Mercedes’ servers, which restricts access to dealers or authorized entities with specific credentials.
Currently, locksmiths without dealer-level access (e.g., via Xentry with FBS4 programming rights) cannot program FBS4 keys independently. For “all keys lost” (AKL) situations or adding new keys, the process typically involves a dealership or an independent shop with official licensing, often requiring the vehicle to be present or specific components (like the Electronic Ignition Switch, EIS) to be sent for programming. This has frustrated many locksmiths, as it limits their ability to offer cost-effective, rapid solutions compared to dealerships, where key replacement can cost $500–$1,500 and involve days or weeks of waiting.
There’s ongoing speculation about whether FBS4 will ever be cracked. Companies like Abrites and Diagspeed have been rumored to be working on solutions, with some suggesting they’ve invested heavily in breaking the system. However, despite years of effort (over a decade since FBS4’s debut), no widely available, reliable aftermarket tool has emerged to bypass it as of now. The encryption is considered “very strong,” and cracking it might require either immense computational power or a breakthrough in reverse-engineering the firmware of FBS4 components—both of which are significant hurdles. Some experts believe that even if a solution is developed, it could be prohibitively expensive (e.g., $20,000+ for a tool) or tightly controlled to avoid legal repercussions from Mercedes-Benz, who closely guards their security systems.
On the flip side, there are hints of progress. For instance, rumours from locksmith forums suggest that independent workshops with Xentry Kit 4 and NASTF licensing can sometimes order FBS4 keys, blurring the line between dealer-only and aftermarket capabilities. Additionally, Mercedes has reportedly expanded FBS4 programming access to some independent shops via Xentry since mid-2023, which might indicate a shift in policy rather than a crack. However, this still requires official authorization, not a true “crack” usable by the average locksmith.
Looking forward, the likelihood of FBS4 being cracked depends on the persistence of developers and the evolution of Mercedes’ security. If a breakthrough occurs, it might coincide with older FBS4-equipped models (e.g., 2014–2018 vehicles) becoming less valuable, reducing Mercedes’ incentive to pursue legal action against toolmakers. Alternatively, as newer systems (like digital keys via NFC) roll out, focus might shift away from FBS4 altogether. For now, though, locksmiths are largely stuck relying on dealerships or workarounds like retrofitting FBS3 components into compatible models (where feasible), which isn’t a universal fix.
In short, while it’s possible FBS4 could be cracked eventually, there’s no concrete evidence it’s imminent as of February 2025. The consensus among locksmith communities is cautious pessimism—don’t hold your breath, but don’t rule it out entirely. For practical purposes, locksmiths dealing with FBS4-equipped Mercedes vehicles should expect to collaborate with dealers or invest in official tools and credentials rather than awaiting an underground solution.