We've updated our reliability stats for the A4 / S4 to include owner experiences through March 31, 2013.

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

2008 A4: 68, moderate
2008 S4 / RS4: 24, low, very small sample size
2007 A4: 38, low
2007 S4 / RS4: 76, moderate, small sample size
2005.5-2006 A4: 85, high
2005.5-2006 S4: 86, high

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: 70, < 1
2005.5-2006 A4: 45, 8

We'll have further updates in August and in November. 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 June 30, 2013. (Another source is about 14 months behind.)

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

2008 A4: 35, low
2008 S4 / RS4: 36, low, very small sample size
2007 A4: 50, moderate
2007 S4 / RS4: 58, moderate, small sample size
2005.5-2006 A4: 108, high
2005.5-2006 S4: 91, high, 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:

2011 A4: 84, 5
2011 S4: 88, < 1
2010 A4: 64, 2
2010 S4: 90, 3
2009 A4: 51, 2
2008 A4: 74, 3
2007 A4: 58, < 1
2005.5-2006 A4: 34, 9

We'll have further updates in November and February.

To see how competitors compare, and to sign up to help us provide more precise stats and cover more model years:

Audi A4 / S4 reliability ratings and comparisons

 

We've updated our reliability stats for the A4 / S4 to include owner experiences through September 30, 2013.

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

2008 A4: 40, low
2008 S4 / RS4: 33, low, very small sample size
2007 A4: 58, moderate
2007 S4 / RS4: 70, moderate
2005.5-2006 A4: 90, high
2005.5-2006 S4: 103, high, 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: 65, < 1
2007 A4: 58, 3
2005.5-2006 A4: 38, 10

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

 

Mike need to report my motor mounts went out at 104k miles.

 

Thanks for letting me know. Have you done this?

 

We've updated our reliability stats for the A4 / S4 to include owner experiences through December 31, 2013.

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

2008 A4: 56, moderate
2008 S4 / RS4: 58, moderate, very small sample size
2007 A4: 65, moderate
2007 S4 / RS4: 68, moderate, small sample size
2005.5-2006 A4: 86, moderate
2005.5-2006 S4: 71, 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: 67, 6
2007 A4: 58, < 1
2005.5-2006 A4: 39, 7

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

To see the repairs behind these stats, and to sign up to help improve this information:

Audi A4 / S4 reliability ratings and comparisons

 

Here is some data that can be added.
2007 A4 2.0T bought Certified 36K miles
Approximate miles rounded off
55K miles O2 sensor (certified covered $100 deductible)
60K coil pack - (certified covered $100 deductible)
70K motor mounts. (certified covered $100 deductible)
90K - AC control unit went bad shorted out both fans -(now out of certified warranty 1.8K repair)
92K - Valve cover leaking
95K - CV boot cracked.
105K - Temp sensor
105K - Control arm bushings cracked,
106K - noise issues with front end have not had $$ to fix yet.

As a note I paid more to fix/maintain (add 1 quart of oil every ~1.2K miles) my car during the certified period ( 2 years) than my wife did out of warranty with her 2003 Acura with more miles.

 

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:

2008 A4: 44, low
2008 S4 / RS4: 51, moderate, very small sample size
2007 A4: 85, moderate
2007 S4 / RS4: 67, moderate, small sample size
2005.5-2006 A4: 100, high
2005.5-2006 S4: 58, 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:

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
2008 A4: 67, < 1
2007 A4: 44, 6
2005.5-2006 A4: 41, 7

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:

2008 A4: 50, moderate
2008 S4 / RS4: 60, moderate, very small sample size
2007 A4: 74, moderate
2007 S4 / RS4: 55, moderate, small sample size
2005.5-2006 A4: 77, moderate
2005.5-2006 S4: 76, 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: 61, < 1
2007 A4: 42, 3
2005.5-2006 A4: 55, 2

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

 

Just letting everyone know that the wbt engine on the a4 this year has a issue with the camshaft lobe and high pressure fuel pump premature wearing this happens most start around 60k on the vehicle. This issue was know back in 2010. That's on 2008 model. Just pointing to everyone that it took Audi almost 7 years before they did the recall for camshaft lobe and high pressure fuel pumps for the 2002 to 2007 models. Audi just playing the number game and hope most vehicle are off the road. The reason I know is I work for Audi dealership for 13 years and I have seen this issue. I check with Audi before I brought the 2008 A4 and was told the problem has be fixed with the camshaft lobe issue. Now vehicle has 83k on it but before that the fuel pressure fault came up after the recall for fuel pressure was replaced. Check the camshaft lobe and high pressure pump just after warranty expired notice a little wear check with Audi recall and Audi techincal line was told not covered plus this issue has been fixed for the 2008 models. Once upon a time I was proud i work for Audi dealership but now sorry to say I will never buy Audi vehicle the remaining of my life.