From a previous thread:
I don't really take the IQS seriously. C&D did an article a few years ago
http://www.caranddriver.com/features...-study-feature
Cliff's notes from the article, JD Power equally counts 'people being annoyed with buttons on a radio' with 'people with blown engines' as 'problems'. No individual or company can see the details unless they're willing to pay JD Power some large sum of money.
Aka, the survey is nonsense and no one should pay attention to it.