Based on problems per 100 vehicles, Scion ranked well below the industry average in the 2009 Vehicle Dependability Study by J.D. Power and Associates. Toyota and Lexus; however, were near the top of the list, well above the average. (higher on list = fewer problems)
http://scionnews.net/2009/03/19/scion-below-industry-average-in-vehicle-dependability-study/
http://scionnews.net/2009/03/19/scion-below-industry-average-in-vehicle-dependability-study/