How much distance is left when the parking sensor displays 0.0?
2 Answers
If the parking sensor displays 0.0, there is generally about 30cm left behind the vehicle. Additional information: 1. Parking sensor: The parking sensor (PDC), also known as "Reverse Parking Collision Avoidance Radar" or "Parking Assistance Device," is a safety auxiliary device for parking or reversing a car. It consists of ultrasonic sensors (commonly called probes), a controller, and a display (or buzzer). 2. Function: When reversing, it helps the driver "see" things that are not visible in the rearview mirror, informing the driver about surrounding obstacles through sound or a more intuitive display. It eliminates the troubles caused by the driver's need to look around when parking, reversing, or starting the vehicle, and helps the driver overcome blind spots and unclear vision, thereby improving driving safety.
From a mechanic's perspective, when the parking radar displays 0.0, it generally means the object behind the vehicle has made contact or is just a few centimeters away. The exact design varies by model—most radars switch to 0.0 when the distance drops below 0.3 meters as an urgent warning to stop. This isn't a precise measurement but a system alert prompting immediate action to avoid collision. The sensors use ultrasonic technology; when echo return time is extremely short, they display 0.0 as a warning. If it persistently shows 0.0 with nothing behind, the sensor might be dirty or damaged—perhaps covered in mud or water ingress. My advice: regularly clean the sensor area, especially after driving in wet or dusty conditions. Don't rely solely on the radar when reversing—combine it with mirror checks for safety, and remember: slow maneuvering is key.
