We have updated our reliability stats for the Sonata to include owner experiences through September 30, 2012.

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

2012: 30, better than average

2011: 52, about average

2010: 17, better than average, small sample size

2009: 18, better than average

2008: 31, better than average

2007: 36, better than average

2006: 45, better than average

2005: 44, better than average, very small sample size

2004: 69, about average

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.

These stats for the years we have them:

2011: 60, 2

2009: 82, < 1

2008: 72, < 1

2006: 70, 5

We'll have further updates in February and May. We'd love to provide more precise stats and cover more model years--just a matter of getting more owners involved.

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

Hyundai Sonata reliability ratings and comparisons

 

We've updated our reliability stats for the Sonata 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:

2013 Sonata: 12, low
2012 Sonata: 19, low
2011 Sonata: 66, high
2010 Sonata: 24, low, small sample size
2009 Sonata: 25, low
2008 Sonata: 21, low
2007 Sonata: 44, low
2006 Sonata: 41, low
2005 Sonata: 47, low, very small sample size
2004 Sonata: 50, low, 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:

2012 Sonata: 85, < 1
2011 Sonata: 56, 3
2009 Sonata: 74, < 1
2006 Sonata: 71, 3

We'll have further updates in November and February. 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:

Hyundai Sonata reliability ratings and comparisons

 

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

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

2013 Sonata: 12, low
2012 Sonata: 11, low
2011 Sonata: 54, moderate
2010 Sonata: 27, low, small sample size
2009 Sonata: 29, low
2008 Sonata: 26, low
2007 Sonata: 51, moderate
2006 Sonata: 54, low
2005 Sonata: 74, moderate, very small sample size
2004 Sonata: 54, low, 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:

2012 Sonata: 86, < 1
2011 Sonata: 63, < 1
2009 Sonata: 73, < 1
2006 Sonata: 59, 3

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:

Hyundai Sonata reliability ratings and comparisons

 

The resource I use is CarComplaints.com | Car Problems, Car Complaints, & Repair/Recall Information

I owned an 09 sonata, and loved it. I only had the TPS go out on it once, and the dealership fixed it for free (even out of warrantee at the time).

 

Carcomplaints is a good source for some information, but they can't provide reliability stats, which is what we focus on.

 

We've updated our reliability stats for the Sonata to include owner experiences through December 31, 2013. This puts them about eight months ahead of other sources.

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

2013 Sonata: 17, low
2012 Sonata: 13, low
2011 Sonata: 43, moderate
2010 Sonata: 38, moderate
2009 Sonata: 32, low
2008 Sonata: 20, low
2007 Sonata: 58, moderate
2006 Sonata: 71, moderate
2005 Sonata: 47, low, very small sample size
2004 Sonata: 55, low, 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:

2012 Sonata: 87, < 1
2011 Sonata: 69, < 1
2009 Sonata: 73, 2
2007 Sonata: 67, < 1
2006 Sonata: 43, 3

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:

Hyundai Sonata reliability ratings and comparisons

 

Our reliability stats for the Sonata 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:

2013 Sonata: 20, low
2012 Sonata: 12, low
2011 Sonata: 45, moderate
2010 Sonata: 38, low, small sample size
2009 Sonata: 32, low
2008 Sonata: 24, low
2007 Sonata: 54, moderate
2006 Sonata: 88, moderate
2005 Sonata: 58, low, very small sample size
2004 Sonata: 61, low, 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 Sonata: 96, < 1
2012 Sonata: 86, < 1
2011 Sonata: 71, < 1
2009 Sonata: 75, 2
2007 Sonata: 65, < 1
2006 Sonata: 40, 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:

Hyundai Sonata reliability ratings and comparisons

 

We've updated our reliability stats for the Sonata 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:

2013 Sonata: 9, low
2012 Sonata: 15, low
2011 Sonata: 36, moderate
2010 Sonata: 42, moderate, small sample size
2009 Sonata: 42, low
2008 Sonata: 31, low
2007 Sonata: 44, low
2006 Sonata: 86, moderate
2005 Sonata: 47, low, very small sample size
2004 Sonata: 65, low, 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 Sonata: 95, 3
2012 Sonata: 86, < 1
2011 Sonata: 77, 1
2009 Sonata: 75, 4
2007 Sonata: 62, < 1
2006 Sonata: 40, 5

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:

Hyundai Sonata reliability ratings and comparisons

 

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

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

2014 Sonata: 14, low, small sample size
2013 Sonata: 13, low
2012 Sonata: 23, low
2011 Sonata: 39, moderate
2010 Sonata: 49, moderate, small sample size
2009 Sonata: 39, low
2008 Sonata: 32, low, small sample size
2007 Sonata: 42, low
2006 Sonata: 84, moderate
2005 Sonata: 40, low, very small sample size
2004 Sonata: 60, low, 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 Sonata: 88, 2
2012 Sonata: 83, < 1
2011 Sonata: 70, 3
2009 Sonata: 69, 5
2006 Sonata: 42, 5

I'd love to also have some stats for the new 2015s--just a matter of getting enough owners involved.

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):

Hyundai Sonata reliability ratings and comparisons

 

New stuff this time. We've updated our reliability stats for the Sonata 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 Sonata: 9, low, small sample size
2013 Sonata: 12, low
2012 Sonata: 21, low
2011 Sonata: 39, moderate
2010 Sonata: 45, moderate, small sample size
2009 Sonata: 36, low
2008 Sonata: 30, low, small sample size
2007 Sonata: 28, low
2006 Sonata: 75, moderate
2005 Sonata: 53, low, very small sample size
2004 Sonata: 63, low, 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 Sonata: 88, 2
2012 Sonata: 82, < 1
2011 Sonata: 72, 1
2009 Sonata: 71, 3
2006 Sonata: 49, < 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:

Hyundai Sonata reliability ratings and comparisons

I've attached the new reliability trends graph, also viewable in the site's reliability area.