Specific retrofit solution for the original tire pressure monitoring system of the Audi A4 B6 Intelligent early warning system for more safety for you and your passengers Monitoring of wheel pressure by pressure sensors in each wheel In the event of a pressure loss, the driver is warned by an acoustic signal and the affected wheel is displayed in the Driver Information System (DIS) This way you optimize the wear of your tires as well as fuel consumption Scope of delivery: Wiring Control unit 4 wheel sensors Antenna Note: Only for use in vehicles with Driver Information System (DIS)