Consumer Protection Law
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Even though this car exporter is located in Japan, you are able to sue the car exporter in US courts because of the contact that they have made in US. What you will need to do is file a complaint in federal court against the Japanese car exporter and properly serve the Japanese exporter.
Japan is part of something known as the "Hague Convention" which allows you to serve your complaint for civil and commercial matters. Due to the complexity of this issue, I would suggest hiring a local attorney who can help you with the process.