Easy with that. Lexus leads, and who makes Lexus. 
Lexus leads the overall nameplate rankings, averaging 84 PP100. This is the 12th time Lexus has been the highest-ranked brand in the 20 years it has been included in the IQS and the first time since 2005.
The Toyota Motor Corporation assembly plant in Higashi-Fuji, Japan, receives the Platinum Plant Quality Award for producing vehicles yielding the fewest defects and malfunctions. Averaging just 29 PP100, the plant produces the Lexus SC 430 and Toyota Corolla. (Plant awards are based solely on average levels of defects and malfunctions and exclude design-related problems.)