What is the reason why the Audi A6 cannot detect obstacles?

[Roxanne]

Audi A6's inability to detect obstacles is caused by sensor abnormalities. Parking assistance system working principle: It includes ultrasonic sensors embedded in the front and rear bumpers, with each sensor having a diameter of approximately 15mm. The ultrasonic detection signals emitted by the sensors will reflect when encountering obstacles. Upon receiving the reflected signals, the sensors promptly feed them back to the system for distance calculation, and alert the driver through sound or video about the distance between the vehicle and obstacles outside the field of vision. Parking assistance system malfunction symptoms: After receiving the vehicle, test driving confirmed the malfunction. When the ignition switch was turned on to start the engine and the transmission was shifted into R gear, it was observed that the red indicator light on the parking assistance system (PTS) button lit up, and neither the front nor rear parking warning indicators responded, indicating that the parking assistance system was in a disabled state.