To access the hidden menu of a Mercedes-Benz vehicle and view vehicle status data, follow these steps: First, without pressing the brake pedal, press the push-button start to power on and illuminate the instrument cluster. Then, press and hold the "Home" button on the left side of the steering wheel for 8 seconds, followed by pressing and holding the "OK" button for 5 seconds to enter the hidden function interface. This interface allows you to check key information such as battery voltage, oil condition, and maintenance reminders, enabling you to monitor the vehicle's health independently without visiting a dealership. This function is available on most Mercedes-Benz models equipped with a multifunction steering wheel, including popular series like the C-Class and E-Class. The hidden menu's utility lies in its ability to promptly identify potential issues, such as battery deterioration or abnormal oil consumption. If the menu fails to appear after performing the steps, it may be due to insufficient timing between operations or the vehicle model not supporting this feature.
