What is the reason for the failure of Audi A3's hill hold assist function?

[ReeseAnn]

Audi A3's hill hold assist function failure is caused by sensor malfunction. Sensor malfunction: The hill hold assist function failure is caused by sensor malfunction. The hill hold assist system mainly relies on two sensors to work, one is the vehicle longitudinal position balance sensor, and the other is the tire torque sensor. If the sensors malfunction, the hill hold assist function cannot be used normally. The two sensors that the hill hold assist system relies on: One is the vehicle longitudinal position balance sensor, and the other is the tire torque sensor, which mainly monitors the negative torque of the tires. The hill hold assist system includes uphill assist and downhill assist. Uphill assist prevents the vehicle from rolling back when starting on an uphill slope, while downhill assist controls the braking system on steep downhill slopes to maintain a certain speed.