We've updated our reliability stats for the A4 / S4 to include owner experiences through September 30, 2014.

Repair frequencies, in terms of repair trips per 100 cars per year:

2008 A4: 45, low
2008 S4 / RS4: 61, moderate, very small sample size
2007 A4: 72, moderate
2007 S4 / RS4: 62, moderate, small sample size
2005.5-2006 A4: 73, moderate
2005.5-2006 S4: 82, moderate, small sample size

We have two additional statistics, "Nada-odds" and "Lemon-odds", to indicate the percentage of cars with no repairs in the past year and those that required 3+ trips to the repair shop:

2008 A4: 58, < 1
2007 A4: 55, 5
2005.5-2006 A4: 51, < 1

To view the repairs behind these numbers, check the stats for other cars, and sign up to help improve this information (next update in February):

Audi A4 / S4 reliability ratings and comparisons

 

We've updated our reliability stats for the A4 / S4 to include owner experiences through the end of 2014.

Repair frequencies, in terms of repair trips per 100 cars per year:

2008 A4: 48, low
2008 S4 / RS4: 55, moderate, very small sample size
2007 A4: 68, moderate
2007 S4 / RS4: 59, moderate, small sample size
2005.5-2006 A4: 78, moderate
2005.5-2006 S4: 96, high, very small sample size

We have two additional statistics, "Nada-odds" and "Lemon-odds", to indicate the percentage of cars with no repairs in the past year and those that required 3+ trips to the repair shop:

2008 A4: 61, 3
2007 A4: 58, < 1
2005.5-2006 A4: 42, < 1

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

To see how competitors compare, and to sign up to help improve this information:

Audi A4 / S4 reliability ratings and comparisons

 

So, how have these cars been doing lately?

Our reliability stats for the A4 / S4 now include owner experiences through March 31, 2015. (Others are nearly a year behind.)

In terms of repair trips per 100 cars per year:

2008 A4: 72, moderate
2008 S4 / RS4: 107, high, very small sample size
2007 A4: 58, moderate
2007 S4 / RS4: 83, moderate, small sample size
2005.5-2006 A4: 71, moderate
2005.5-2006 S4: 84, moderate, small sample size

We have two additional statistics, "Nada-odds" and "Lemon-odds", to indicate the percentage of cars with no repairs in the past year and those that required 3+ trips to the repair shop:

2008 A4: 48, 3
2007 A4: 54, 4
2005.5-2006 A4: 47, 2

Next updates in August and in November. The more owners participate, the more comprehensive and precise these will be.

For repair descriptions, the stats for other cars, and to sign up to help improve this information:

Audi A4 / S4 reliability

 

Our reliability stats for the A4 / S4 now cover the year ending June 30, 2015. (Others are over a year behind, and so report how these cars were doing when a year younger.)

Repair trips per 100 cars:

2008 A4: 58, moderate
2008 S4 / RS4: 82, moderate, very small sample size
2007 A4: 72, moderate
2007 S4 / RS4: 85, moderate, small sample size
2005.5-2006 A4: 84, moderate
2005.5-2006 S4: 81, moderate, small sample size

We have two additional statistics, "Nada-odds" and "Lemon-odds", to indicate the percentage of cars with no repairs in the past year and those that required 3+ trips to the repair shop:

2008 A4: 66, < 1
2007 A4: 54, 4
2005.5-2006 A4: 37, 5

If a sample size is small, then we especially need more owners involved.

For the descriptions of all reported repairs, results for other models, and to sign up to help improve this information:

Audi A4 / S4 reliability ratings and comparisons

 

We've updated our reliability stats for the A4 / S4 to include owner experiences through September 30, 2015. Repair frequencies, in terms of repair trips per 100 cars per year:

2008 A4: 73, moderate
2008 S4 / RS4: 89, high, very small sample size
2007 A4: 82, moderate
2007 S4 / RS4: 78, moderate, small sample size
2005.5-2006 A4: 86, moderate
2005.5-2006 S4: 40, low, very small sample size

We have two additional statistics, "Nada-odds" and "Lemon-odds", to indicate the percentage of cars with no repairs in the past year and those that required 3+ trips to the repair shop:

2008 A4: 64, < 1
2007 A4: 52, 8
2005.5-2006 A4: 41, 2

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

To see how competitors compare, and to sign up to help improve this information:

Audi A4 / S4 reliability ratings and comparisons

 

We've updated our reliability stats for the A4 / S4 to include owner experiences through the end of 2015, about eight months ahead of other sources.

In terms of repair trips per 100 cars per year--lower is better:

2008 A4: 80, moderate
2008 S4 / RS4: 112, high, very small sample size
2007 A4: 85, moderate
2007 S4 / RS4: 67, moderate, small sample size
2005.5-2006 A4: 84, moderate
2005.5-2006 S4: 55, low, very small sample size

We have two additional statistics, "Nada-odds" and "Lemon-odds", to indicate the percentage of cars with no repairs in the past year and those that required 3+ trips to the repair shop:

2008 A4: 58, 4
2007 A4: 49, 3
2005.5-2006 A4: 50, 5

We'll have further updates in May and in August. 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

 

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:

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

We have two additional statistics, "Nada-odds" and "Lemon-odds", to indicate the percentage of cars with no repairs in the past year and those that required 3+ trips to the repair shop:

2008 A4: 41, < 1
2007 A4: 42, < 1
2005.5-2006 A4: 38, 5

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

 

We've updated our reliability stats for the A4 / S4 to include owner experiences through September 30, 2016.

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

2008 A4: 81, moderate
2007 A4: 65, moderate
2007 S4 / RS4: 24, low, small sample size
2005.5-2006 A4: 106, high
2005.5-2006 S4: 137, high, very small sample size

We have two additional statistics, "Nada-odds" and "Lemon-odds", to indicate the percentage of cars with no repairs in the past year and those that required 3+ trips to the repair shop:

2007 A4: 47, < 1
2005.5-2006 A4: 34, 8

Additional participants always helpful.

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