What does it mean when the Mercedes-Benz Run-Flat Indicator stops working?
2 Answers
When the Mercedes-Benz Run-Flat Indicator stops working, it indicates that the pressure in at least one tire deviates from the pressure recorded during the last reset. It is necessary to check the tire pressure and perform a reset. If the tire pressure is insufficient, the dashboard will reactivate the Run-Flat Indicator. The vehicle owner should first check the pressure in all four tires. If the indicator persists after adjustments, the tire pressure needs to be restored and reset. If one or more tires have low pressure, first identify which tire(s) are affected. The recommended pressure is 2.4 bar for the front tires and 2.6 bar for the rear tires. After addressing any leaks, turn the ignition to position 2. Use the buttons on the steering wheel to access the maintenance menu on the dashboard, select 'Tire Pressure Normal,' and confirm to stop the warning. Reset method: Turn the key to position 2, use the left menu button on the steering wheel to display the odometer interface on the dashboard, then press the up button on the left side of the steering wheel; The dashboard will display 'Run-Flat Indicator Reactivated,' press the R button on the dashboard; The dashboard will show whether the tire pressure is normal; Press the plus button on the right side of the steering wheel, wait for 10 seconds, then turn off the key and restart the vehicle.
Recently, the low-pressure run-flat indicator on my Mercedes stopped working, which makes me a bit uneasy. Having driven a Mercedes for years, I know this thing monitors tire pressure. If it fails to alert when the pressure is low, the tires could wear out or even blow out, especially at high speeds, which is very dangerous. Common causes include the sensor battery running out—usually needing replacement every 5 years—or dust blocking the sensor, preventing signals from reaching the system. When I encountered this before, I first checked the tire pressure myself with a gauge to ensure it was normal. If not, I went to the dealership for inspection. The mechanic said Mercedes' TPMS is complex and requires a diagnostic tool for repairs. It's advised not to tamper with it yourself—safety comes first. Tire health directly affects handling and fuel efficiency, so I make it a habit to check tire pressure monthly to prevent issues.
