Toyota Motor Corp. said Wednesday it is recalling about 550,000 vehicles worldwide - mostly in the United States - for problems that could make it harder to steer. The recall affects 447,000 vehicles in North America, as well as 38,000 in Japan and another 25,000 in Australia and New Zealand, said Toyota spokesman Dion Corbett. In Europe some 14,000 vehicles are being recalled along with 10,000 in the Middle East and 14,000 in Asia outside Japan.