Honda Motor Co.'s No. 2 executive, asked to identify the automaker's weak spot, spoke bluntly: Acura luxury sedans have to get better.

The world will soon learn whether they have. Next month Honda will introduce the Acura TLX to replace its aging TL, the brand's top-selling sedan that was last revamped five years ago.

Designed by Honda's North American unit, the reworked luxury car will be the latest test of the automaker's decision to give more influence to U.S. engineers.