5th Generation A6 (2019–2021)
This generation ranks 14th in reliability out of 66 eligible Audi generations.
4th Generation A6 (2012–2018)
This generation ranks 34th in reliability out of 66 eligible Audi generations.
3rd Generation A6 (2005–2011)
This generation ranks 28th in reliability out of 66 eligible Audi generations.
2nd Generation A6 (1998–2004)
This generation ranks 32nd in reliability out of 66 eligible Audi generations.
1st Generation A6 (1995–1997)
This generation ranks 5th in reliability out of 66 eligible Audi generations.
Audi A6 Generations

The A6 has 5 generations available in North American markets. A generation is a group of model years where few, if any, changes were made to the vehicle which means their model years tend to break in similar ways.
The 4th generation (2012—2018) has been the least reliable.
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The best way to find out what's wrong with a vehicle is from the people who drive them. Not only do owner complaints help us rank vehicles by reliability, but they're often used to spark class-action lawsuits and warranty extensions. Plus, they're a great way to vent.