While a dirty lens won't cause B1FBD54, a damaged or flooded camera can cause the system to lose calibration.

This comprehensive technical guide breaks down why this error occurs, how it impacts your Mercedes-Benz driving assistance ecosystem, and how to successfully execute the required calibration workflow to resolve it. Technical Definition: What is Error B1FBD54?

In his world, that usually meant one of two things: either the car had been in a collision the owner wasn't mentioning, or a sensor was hallucinating. He began the "Pre-Safe" checklist—cleaning the radar sensors tucked behind the front bumper and the cameras mounted near the rearview mirror. Often, a bit of road grime or heavy rain is enough to trigger a "Functions Limited" warning. But the sensors were spotless.