Generally, auction vehicles are not covered by any warranty and are sold "as is." Buyers must check the vehicle details carefully before bidding. This is true even at large auction houses and smaller markets. However, some special certified auctions or dealers might offer a very limited, short-term service contract. If you are looking at the Mi Auto Japan used car market in Hiroshima (https://www.miauto.jp/), always confirm the specific terms directly with the seller before purchasing to understand your risk.