A8 Quattro Sedan V8-4.2L (BGK) (2006)
Central Control Module: All Technical Service Bulletins
Audio System - MMI Surround Setting Is Lost
91 MMI Surround Setting Lost
91 09 18
2013108/4
March 25, 2009
Supersedes Technical Service Bulletin Group 91 number 08-138 dated November 12, 2008 for reasons listed below.
Vehicle Information
Condition
The customer complaint is that the DSP BOSE sound setting does not remain on surround fr or surround rear.
Instead, normal is displayed, and the corresponding sound focus is audible.
Technical Background