Mercedes-Benz S350 key recognition issue preventing engine start on Mercedes-Benz S350

Some Mercedes-Benz S350 owners report experiencing key recognition issues that prevent the engine from starting, often encountering messages such as "Key not detected" or "Key not recognized," particularly with vehicles utilizing the latest FBS4 technology. Additionally, problems with the ignition system can lead to silence when attempting to start the engine, indicating potential defects. In some instances, owners find that the remote key may stop working due to pairing issues, which can be resolved through reprogramming with an OBDII scanner. Furthermore, replacing the battery in the key fob can sometimes rectify recognition problems, especially in models with keyless entry systems. Maintaining cleanliness of the key fob and ignition area, using genuine Mercedes-Benz keys, and scheduling routine inspections with a certified technician can help detect and address these issues early. It is crucial for owners to address these common causes promptly to efficiently resolve the problem and ensure their vehicle is operational.