Our reliability stats for the A4 / S4 now include owner experiences through March 31, 2014, making them nearly a year ahead of other sources.

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

2014 A4 / S4: 0, low, small sample size
2013 A4 / S4: 17, low
2012 A4: 9, low
2012 S4: 43, moderate
2011 A4: 44, moderate
2011 S4: 40, moderate
2010 A4: 63, moderate
2010 S4: 45, moderate
2009 A4 2.0T: 55, moderate
2009 A4 3.2: 55, moderate

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:

2013 A4 / S4: 85, < 1
2011 A4: 76, 3
2011 S4: 75, 3
2010 S4: 64, < 1
2009 A4 2.0T: 63, 4
2009 A4 3.2: 60, 3

Thank you, once again, everyone who has been helping. Next update in August.

For a deeper dive, including the stats for other cars and repair descriptions, 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, 2014 (making them about 14 months ahead of some others).

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

2014 A4 / S4: 0, low
2013 A4 / S4: 11, low
2012 A4: 12, low
2012 S4: 29, low
2011 A4: 42, moderate
2011 S4: 48, moderate
2010 A4: 49, moderate
2010 S4: 46, moderate
2009 A4 2.0T: 64, moderate
2009 A4 3.2: 40, low

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:

2013 A4 / S4: 90, < 1
2012 S4: 69, < 1
2011 A4: 72, < 1
2011 S4: 74, 3
2010 S4: 66, 2
2009 A4 2.0T: 54, 3
2009 A4 3.2: 75, < 1

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

For repair descriptions, the stats of other cars, 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, 2014.

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

2014 A4 / S4: 5, low
2013 A4 / S4: 11, low
2012 A4: 26, low
2012 S4: 46, moderate
2011 A4: 55, moderate
2011 S4: 49, moderate
2010 A4: 37, low
2010 S4: 53, moderate
2009 A4 2.0T: 56, moderate
2009 A4 3.2: 61, moderate

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:

2013 A4 / S4: 91, < 1
2012 S4: 52, 3
2011 A4: 61, < 1
2011 S4: 67, 6
2010 S4: 60, < 1
2009 A4 2.0T: 59, 3
2009 A4 3.2: 71, 8

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

 

New stuff this time. We've updated our reliability stats for the A4 / S4 to include owner experiences through the end of 2014. Plus we've added reliability trends graphs. These indicate how a model's reliability has changed as it has aged, and how different model years performed when the same age.

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

2014 A4 / S4: 10, low
2013 A4 / S4: 9, low
2012 A4: 26, low
2012 S4: 48, moderate
2011 A4: 61, moderate
2011 S4: 57, moderate
2010 A4: 34, low
2010 S4: 47, moderate
2009 A4 2.0T: 62, moderate
2009 A4 3.2: 44, low

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:

2013 A4 / S4: 93, < 1
2012 S4: 60, < 1
2011 A4: 59, < 1
2011 S4: 57, 5
2010 S4: 65, 2
2009 A4 2.0T: 62, 6
2009 A4 3.2: 66, 4

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

For the details, including how competitors compare, and to sign up to help improve this information:

Audi A4 / S4 reliability ratings and comparisons

I've attached the new graph. It's on the busy side since we've split by powertrain for a few years.

 

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 ("low" is best):

2015 A4 / S4: 18, low, very small sample size -- especially need more of these
2014 A4 / S4: 10, low
2013 A4 / S4: 6, low
2012 A4: 26, low
2012 S4: 56, moderate
2011 A4: 49, moderate
2011 S4: 45, moderate
2010 A4: 27, low
2010 S4: 50, moderate
2009 A4 2.0T: 64, moderate
2009 A4 3.2: 41, low

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:

2014 A4 / S4: 91, < 1
2013 A4 / S4: 95, < 1
2012 S4: 60, < 1
2011 A4: 56, < 1
2011 S4: 61, 3
2010 S4: 69, 4
2009 A4 2.0T: 56, 3
2009 A4 3.2: 64, 4

Next updates in August and November.

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:

2015 A4 / S4: 30, moderate, small sample size
2014 A4 / S4: 14, low
2013 A4 / S4: 15, low
2012 A4: 35, low
2012 S4: 60, moderate
2011 A4: 54, moderate
2011 S4: 54, moderate
2010 A4: 46, moderate
2010 S4: 53, moderate
2009 A4 2.0T: 69, moderate
2009 A4 3.2: 46, low

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:

2014 A4 / S4: 83, < 1
2013 A4 / S4: 88, < 1
2012 S4: 53, < 1
2011 A4: 58, < 1
2011 S4: 59, < 1
2010 S4: 61, 2
2009 A4 2.0T: 46, 7

If a model year isn't listed, or its 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:

2015 A4 / S4: 27, low
2014 A4 / S4: 21, low
2013 A4 / S4: 31, low
2012 A4: 26, low
2012 S4: 54, moderate
2011 A4: 38, low
2011 S4: 50, moderate
2010 A4: 61, moderate
2010 S4: 55, moderate
2009 A4 2.0T: 87, high
2009 A4 3.2: 40, low

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:

2014 A4 / S4: 80, < 1
2013 A4 / S4: 77, < 1
2012 A4: 75, < 1
2012 S4: 60, 3
2011 A4: 64, < 1
2011 S4: 67, < 1
2010 S4: 58, 3

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

For the details, including repair descriptions, 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:

2015 A4 / S4: 25, low
2014 A4 / S4: 20, low
2013 A4 / S4: 34, moderate
2012 A4: 34, low
2012 S4: 40, moderate
2011 A4: 38, low
2011 S4: 47, moderate
2010 A4: 69, moderate
2010 S4: 62, moderate
2009 A4 2.0T: 89, high
2009 A4 3.2: 53, moderate

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:

2014 A4 / S4: 82, < 1
2013 A4 / S4: 74, < 1
2012 A4: 72, < 1
2012 S4: 73, < 1
2011 A4: 74, < 1
2011 S4: 57, < 1
2010 S4: 64, 10

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 (lower is better):

2016 A4 / S4: 29, moderate, small sample size
2015 A4 / S4: 15, low
2014 A4 / S4: 30, moderate
2013 A4 / S4: 40, moderate
2012 A4: 28, low
2012 S4: 19, low
2011 A4: 26, low
2011 S4: 55, moderate
2010 A4: 55, moderate
2010 S4: 54, moderate
2009 A4 2.0T: 54, moderate
2009 A4 3.2: 47, low

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:

2015 A4 / S4: 87, < 1
2014 A4 / S4: 71, < 1
2013 A4 / S4: 72, 3
2012 A4: 76, < 1
2012 S4: 83, < 1
2011 S4: 62, < 1
2010 S4: 63, < 1
2009 A4 3.2: 72, 4

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):

2016 A4 / S4: 28, moderate, small sample size
2015 A4 / S4: 20, low
2014 A4 / S4: 27, moderate
2013 A4 / S4: 29, moderate
2012 A4: 34, moderate
2012 S4: 26, low
2011 A4: 38, moderate
2011 S4: 54, moderate
2010 A4: 46, moderate
2010 S4: 55, moderate
2009 A4 2.0T: 62, moderate
2009 A4 3.2: 57, moderate

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:

2015 A4 / S4: 80, < 1
2014 A4 / S4: 79, 2
2013 A4 / S4: 75, < 1
2012 A4: 76, < 1
2012 S4: 73, 3
2011 A4: 68, 3
2011 S4: 56, < 1
2010 S4: 56, < 1

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