What Causes a Mercedes-Benz to Trigger Radar Alerts Without Obstacles?
2 Answers
Mercedes-Benz owners often encounter situations where the radar continuously alerts despite no obstacles being present. Here are the reasons why a Mercedes-Benz radar may sound without obstacles: 1. License Plate Issues: Particularly with front radars, which generally require a wide detection range, the radar's ultrasonic waves are fan-shaped. If the license plate frame is too large or the plate is bent or deformed, it may enter the radar's detection range, causing false alarms. This issue commonly occurs with new cars or those that have recently had their license plates reinstalled. 2. Dirty or Obstructed Radar Sensors: This is also quite common. For example, after washing the car or driving through muddy roads in the rain, mud or rainwater on the bumper may be detected by the radar or directly cover the sensors. 3. Hardware-Related Radar Issues: Such as dented sensors, damaged or deformed sensor mounts, or faulty sensors themselves. 4. Sensor Installation Problems: On some modified vehicles, careless installation may cause the sensors to angle downward or be mounted too low, leading to false alarms when encountering small bumps or uneven ground. 5. Obstacles on the Vehicle's Side: It's important to note that radar sensors do not only emit ultrasonic waves forward/backward. If there are obstacles on the side of the vehicle and they are relatively close, they may also be detected.
My Mercedes-Benz car's radar sometimes gives false alarms for no reason, even when there are no obstacles ahead. This could be because the radar sensor is dirty, such as being covered in mud or dust, causing the system to mistakenly detect something. Or it might be due to weather conditions, like rain or fog, where radar waves scatter off water droplets, creating false signals. Also, when parking near highly reflective walls or metal objects, the radar might bounce back false alarms. I've experienced this several times while driving, and later I found that regularly cleaning the sensors and keeping the surroundings clean can reduce the issue. Additionally, software glitches might also cause false alarms, and the Mercedes system needs timely updates. If this problem is ignored, the radar might fail when it's needed, increasing the risk of accidents. It's recommended to pay special attention to cleaning the radar area during each car wash, and if the issue persists, it's best to visit a 4S shop for inspection to ensure everything is functioning properly.
