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The A6 is Audi's executive sedan, covered from the 1994 C4 through the C5, C6, C7 and C8 generations. Engines range from four-cylinder TFSI and V6 TDI units to the supercharged and turbo 3.0-liter V6.


Model year 2005 is part of the A6 C6 generation (2005–2011). It is the first model year of this generation: the platform, wiring and many procedures changed compared with the previous model, so a manual for an earlier year will not match it.
Check the model year on your VIN: on a 2005 vehicle the 10th character of the 17-digit VIN is “5”. Vehicles built for North America always carry the model year in that position; on some European or Australian vehicles it may be left unused, so in that case go by the registration papers or the build plate.
At about 21 years old, a 2005 vehicle is in the age range where wiring, rubber hoses, seals and corrosion repairs take most of the work, and where original factory information is hardest to find.
Same generation: 2006 Audi A6, 2007 Audi A6, 2008 Audi A6, 2009 Audi A6, 2010 Audi A6, 2011 Audi A6.
All Audi A6 model years: 1994 · 1995 · 1996 · 1997 · 1998 · 1999 · 2000 · 2001 · 2002 · 2003 · 2004 · 2005 · 2006 · 2007 · 2008 · 2009 · 2010 · 2011 · 2012 · 2013 · 2014 · 2015 · 2016 · 2017 · 2018 · 2019 · 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026
Engines
10-cylinder direct petrol injection engine (5.0 ltr. 4-valve turbo RS 6), mechanics BUH
10-cylinder direct petrol injection engine (5.2 ltr. 4-valve), mechanics BXA
4-cylinder TDI engine (2.0 ltr. 4-valve common rail), mechanics CAGB CAHB CAHA
4-cylinder TDI unit injector engine (2.0 ltr. 4-valve), mechanics BLB BNA BRE BRF BVG
4-cylinder direct petrol injection engine (2.0 ltr. 4-valve turbo), mechanics BYK BPJ
6-cylinder TDI engine (2.7 ltr.; 3.0 ltr. 4-valve common rail), mechanics BMK ASB BNG BPP BSG
6-cylinder TDI engine (2.7 ltr.; 3.0 ltr. 4-valve common rail, EU5), mechanics CANA CDYC CDYB CDYA CAND CANB CANC
6-cylinder direct injection engine (2.8 ltr. 4-valve), mechanics BDX CCDA CCEA
6-cylinder direct injection engine with supercharger (3.0 ltr. 4-valve TFSI), mechanics CAJA CCAA
6-cylinder direct petrol injection engine (3.2 ltr. 4-valve), mechanics BYU BKH AUK
6-cylinder injection engine (2.4 ltr. 4-valve), mechanics BDW
6-cylinder injection engine (3.0 ltr. 5-valve), mechanics BBJ
8-cylinder direct petrol injection engine (4.2 ltr. 4-valve), mechanics BVJ
8-cylinder engine (4.2 ltr. 5-valve with timing chains), mechanics BNK BAT
