関連ワード:  audi a4 b9 common problems    audi a4 b9 5 common problems    audi a4 b9 known issues    audi a4 b9 2.0 tdi common problems    audi a4 b9 3.0 tdi common problems    audi a4 b9 2.0 tfsi common problems    is the audi a4 b9 reliable    audi a4 b8 common problems    audi a4 b7 common problems    audi a4 b7 common issues