Due to a manufacturing defect, a crack can develop on the fuel filter when the vehicle is operated in high temperatures. This crack can result in a fuel leak, increasing the risk of a fire. Dealers will replace the fuel filter to correct this concern.
 
Resources for the Repair and Maintenance of your Mercedes-Benz S400 Hybrid
Mercedes-Benz S400 Hybrid Models:
Mercedes-Benz S400 Hybrid Recalls (Recent)
Mercedes-Benz S400 Hybrid Model Years
Recent Mercedes-Benz Repair Estimates