Toyota's second quarter profit more than quadrupled on a sales recovery despite lingering worries about the quality of its cars, especially in the key U.S. market, after massive recalls.

Toyota reported July-September profit of ¥98.7 billion on Friday, up dramatically from ¥21.8 billion a year earlier but lower than analysts expected. Quarterly sales rose 5.8 percent to ¥4.807 trillion.

Toyota Motor Corp. is the only major automaker whose U.S. sales have been sluggish despite a recent onslaught of incentives that have boosted other automakers' results — underlining how its once sterling image continues to be tarnished in that key market.