What Causes No Data from the Front Assist System Sensor?
3 Answers
No data from the front assist sensor is caused by damage to the front assist system sensor or long-term imbalance in radar detection. Below are the detailed explanations: Damage to the Front Assist System Sensor: The front assist system, also known as the pre-collision safety system, continuously monitors the distance to the vehicle ahead. If the distance exceeds the safe range, it identifies a potential collision and issues a warning to prompt the driver to take necessary action. If the driver fails to respond, the system automatically applies the brakes. In the event of a potential collision, it helps mitigate the consequences within the system's limits or ideally avoids the accident altogether. If there is no data from the front assist sensor, it is necessary to visit a 4S shop or repair shop for diagnosis and repair using a fault detection device. Long-Term Imbalance in Radar Detection: Check if there is any dirt or rainwater on the sensor surface, as contaminants can affect the sensor. Heavy rain or winding mountain roads may also result in no data. Since the front assist system sensor operates continuously, long-term imbalance in radar detection caused by harsh conditions such as mountain roads or rainy weather may lead to undetectable data, triggering a "no data" warning from the front assist system sensor.
I've been driving for over a decade and have encountered several issues with the front assist system. The most common problem is when the radar sensor on the front grille gets covered with mud or snow, especially in winter when roads are salted and get dirty easily. Another issue is when the sensor gets hit or becomes loose and shifts position, as this component requires very precise installation. Additionally, water ingress during heavy rain or when driving through water can cause short circuits, triggering a sensor malfunction warning on the dashboard. My suggestion is to first clean the sensor surface with a damp cloth and restart the vehicle. If there's still no data, it's best to visit a workshop to read the fault codes with a diagnostic computer – the module might need replacement if it's faulty. When washing the car, avoid using high-pressure water jets directly on the sensor area.
I just bought this car six months ago, and last week I also got a warning about the front assist sensor failure. I was really panicked at the time, and only after calling the 4S store did I realize it might be a minor issue. The technician said to first check if the related fuse in the fuse box had blown, because unstable voltage can easily cause fuses to blow. They also reminded me to check if there was any obstruction in the camera area above the windshield, as sometimes a misplaced parking permit can block the view. Later, it turned out to be a false alarm caused by cleaning agent residue on the sensor surface after washing the car. Additionally, modifying the grille or applying a car wrap might alter the sensor's emission angle, so these things need to be taken into consideration.
