One problem related to blind spot detection has been reported for the 2015 Audi A8. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Audi A8 based on all problems reported for the 2015 A8.
Front collision warning system light does not illuminate in the heads up display and the Audio portion of the alarm is not Audible. I have taken this to the dealer and they have no resolution. The blind side warning system has no Audio.