Re: Audi A4 problem !?
I suggest your frien dshould first have a look at the system
In a 2002 A4 the only systems available were RNS-E with color display and BNS 4.0 with small red screen in between the instruments
The 2004 A4 has the possibility of RNS-E and BNS 5.0 A mionochrome display with a computer that use TarvelPilot-E cd's which cannot be copied
The MMI Basic Plus system was only introduced in the A4 from 2008 onwards. Other models from 2004
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