What does it mean when the Mercedes-Benz Run-Flat Indicator stops working?

[MollyFitz]

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.

[MaciDella]

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.

[VanMackenzie]

The low-pressure run-flat indicator on the Mercedes has stopped working, which means the Tire Pressure Monitoring System (TPMS) has failed. The TPMS relies on sensors inside the tires to transmit data, and if it malfunctions, you won’t know when the tire pressure is low. There are several possible causes: the sensor battery may be depleted, wireless signals could be interfered with, or there might be a fault in the system's circuitry. From a technical perspective, Mercedes sensors typically require battery replacement every seven years, and they must be matched to the vehicle's original frequency for reliability. Software issues may require a module reset, which can be done via the steering wheel buttons to access the menu. If not addressed promptly, this could damage the tires or even the rims. I recommend using an OBD diagnostic tool to read the fault codes for accurate troubleshooting and to avoid misinterpreting it as a false alarm. Tire safety affects the overall balance of the vehicle, and regular TPMS calibration can extend its lifespan—detailed steps are provided in the Mercedes manual. This system is critical for safety, so don’t cut corners.

[DelLouis]

This indicator malfunction is quite concerning, especially when driving at night. Mercedes-Benz uses it to alert you when tire pressure is low. If it stops working, you might miss the risk of a flat tire or loss of control. A friend of mine had an accident on the highway precisely because the tire pressure warning failed. The cause is usually aging sensors or a faulty electronic control unit – get it checked at a professional repair shop immediately. Safety first, as a blown tire makes steering difficult. Additionally, maintaining proper tire pressure saves fuel and reduces wear. Don't delay getting this fixed.