Mitsubishi's U.S. sales grew 8 percent last year to 62,227 vehicles, after hovering below 60,000 vehicles a year since 2009, except for a spike in 2011.
During that period, U.S.-built models such as the Eclipse coupe, Endeavor crossover and Galant mid-sized sedan were phased out of the U.S. lineup as the automaker scaled back on regional vehicle platforms in favor of vehicles it could sell worldwide, such as the Outlander Sport.
Yokozawa oversaw the launch of the Mitsubishi i-MiEV electric vehicle, as well as the Outlander and Outlander Sport crossovers and the Mirage small car.
Also during his tenure, Mitsubishi invested more than $100 million to retool its lone U.S. assembly plant in Normal, Ill., to build the Outlander Sport compact crossover for sales in North America and export starting in 2012.
Yokozawa will return to Mitsubishi headquarters in Japan for an assignment in the automaker's corporate planning office, the company said in a statement.