Why does the front parking sensor keep beeping?

[StGemma]

There are several possible reasons why the front parking sensor keeps beeping: 1. Signal blockage: Something may be stuck on the radar probe, blocking the signal. In this case, check if there is any obstruction in the vehicle's radar hole. 2. Water ingress in the radar: Leakage from the windshield washer hose or water seeping into the radar system. The owner needs to seal the leak (or replace the hose) and drain any accumulated water in the radar system. 3. Signal interference: The radar ultrasonic signal may be malfunctioning, causing false alarms. Restart the engine, drive the vehicle to an open area, and try reversing again to see if the issue persists.

[DiBrody]

A few days ago, I also encountered the issue of the radar constantly beeping, which made driving particularly annoying. Based on the experience of repair shops, the most common cause is the radar sensor being covered by mud or bird droppings—simply cleaning it should fix the problem. Additionally, if a new car's film covers the radar area, it can interfere with the signal. Once, my friend's Tiguan had its radar constantly giving false alarms because the bumper was modified, causing the radar angle to be incorrect. Another possibility is the reflection of signals from metal roller doors in underground parking lots—this usually resolves itself once you drive out. I recommend first wiping the metal surfaces of the front and rear sensors with a damp cloth, especially the area below the license plate. If the beeping continues, it's time to check the wiring—there might be rodent damage or water ingress causing a short circuit. If the repair shop suggests replacing the entire radar module, remember to first check the sensor's temperature, as false alarms are more likely after prolonged exposure to summer heat.

[LeLogan]

I can totally relate to the issue of constant radar alarms, especially the frequent false alarms during heavy rain. Last time on a long drive, the radar kept beeping non-stop, and only after stopping to check did I realize there was a plastic bag stuck to the front bumper. Actually, the working principle of the radar is quite simple—it relies on ultrasonic reflection. When it detects a stationary obstacle within less than 1 meter, it triggers an alarm. I recommend starting with some basic troubleshooting: restart the vehicle after turning it off to see if the situation improves, check if the sensor surface has any dents or damage, and use a diagnostic tool to read fault codes for more accurate results. A friend’s Magotan once had its radar system interfered with by the wiring harness of the reversing camera—re-routing the wires fixed it. If you’ve modified the grille, it might be blocking the radar’s detection path, so remember to go back to the modification shop to adjust the angle. If the alarm persists after rain, it’s likely due to aging waterproof seals on the sensors.

[DelaneyAnn]

The constant beeping of the radar is very annoying. I experienced the same thing after washing my car once. The key is to distinguish whether it's a normal alert or a fault warning: alerting to stationary objects when parking is a normal function, but continuous beeping while driving is abnormal. The most economical solution is to simply clean the sensing area—use a soft brush to clean all four probes. A car repair shop owner told me that newer models often experience false alarms due to incomplete system upgrades, requiring a reprogramming visit to the 4S shop. This is more noticeable in extreme weather—radar penetration decreases in heavy fog or blizzards, and snow covering the probes is common. In such cases, avoid driving fast immediately; wait for conditions to improve before testing. Last month during a repair, I saw an Envision with corroded internal circuit boards in its probes—coastal areas should especially guard against salt mist. Keeping a diagnostic tool handy to read fault codes can be very useful when needed.