Condition Based Service (CBS) sensors identify that a service is needed either for a vehicle fluid change (e.g. engine oil) or a wear-and-tear part replacement (e.g. brake pad). The vehicle then uses an Automatic TeleService Call to transmit service-relevant data to your BMW Service Retailer and a specialist will call you to make an appointment. Due to the accuracy of the data transmitted, the service team can obtain all of the necessary components for your vehicle in advance, which significantly reduces the duration of your appointment.