"Check Control Message ""Fuel tank system faulty"" is displayed. The Check Control Message ""Fuel tank system faulty"" is displayed in the instrument cluster. One or more of the following fault codes are stored: ""806010 - Refueling button: button jammed open"" ""21B022 - Information for refueling button, function: jammed open (reported by TFE)"" CAUSE The locking rod for the locking fuel filler flap is disconnected from the central locking system."