Toyota Motor Corp., Honda Motor Co. and other domestic automakers may lose as many as 193,000 vehicle sales in the United States to competitors this year because of parts shortages here, an A.T. Kearney analyst said Tuesday.

General Motors Co., Ford Motor Co. and Chrysler Group LLC may have about 3,000 sales "up for grabs" because of quake-related disruptions, said Dan Cheng, lead partner of consultant A.T. Kearney's automotive practice. A.T. Kearney computed the figures by estimating lost production for the U.S. market and accounting for brand-loyal customers who may defer purchases.

If full output in Japan doesn't resume until the fourth quarter, disruptions from the quake may boost the number of all automakers' U.S. sales that are up for grabs to 328,000, said Cheng.