Genuine OEM Volkswagen Brake Pad Wear Sensor, part number 2N0615437A. This sensor is integrated into the brake system to monitor the wear level of the brake pads. When the pads reach a critical minimum thickness, the sensor triggers a warning light on the dashboard. It is typically located on the front or rear brake calipers. Genuine OEM sensors provide accurate readings and reliable performance, crucial for driver safety and preventing costly damage to brake rotors.