mkaresh

We've updated our reliability stats for the A4 / S4 to include owner experiences through June 30, 2016. Reliability information elsewhere is based on a survey conducted in April 2015--well over a year ago.

Repair frequencies, in terms of repair trips per 100 cars per year (lower is better):

2008 A4: 89, moderate
2008 S4 / RS4: 110, high, very small sample size
2007 A4: 74, moderate
2007 S4 / RS4: 47, low, small sample size
2005.5-2006 A4: 103, high
2005.5-2006 S4: 85, moderate, very small sample size
2005 A4: 119, high, small sample size
2005 S4: 47, low, very small sample size
2004 A4: 117, moderate, small sample size
2004 S4: 91, moderate, very small sample size

We'll have further updates in November and next February. The more owners participate, the more comprehensive and precise these will be.

For the repairs behind these stats, reliability information on other models, and to sign up to help improve this information:

Audi A4 / S4 reliability ratings and comparisons