The main risk of driving a Volkswagen with a parking sensor problem is that the sensors may not detect obstacles that are near the car. This could lead to a collision if the driver is unaware of the obstacles in the way or fails to take proper measures to avoid them. Additionally, parking sensors are important for ensuring that the car is kept a safe distance away from other vehicles, so not having them could increase the risk of an accident. Finally, parking sensors are important for correctly positioning the car when parking in tight spaces. Without them, it could be difficult or impossible to park the car properly.