5th Generation A4 (2016–2021)
This generation ranks 20th in reliability out of 66 eligible Audi generations.
4th Generation A4 (2008–2015)
This generation ranks 37th in reliability out of 66 eligible Audi generations.
3rd Generation A4 (2005–2007)
This generation ranks 39th in reliability out of 66 eligible Audi generations.
2nd Generation A4 (2001–2004)
This generation ranks 38th in reliability out of 66 eligible Audi generations.
1st Generation A4 (1996–2000)
This generation ranks 30th in reliability out of 66 eligible Audi generations.
Audi A4 Generations

The A4 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 3rd generation (2005—2007) has been the least reliable.
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