The owner of the mortgaged car reported that it had been stolen.

Legal analysis: if the car is mortgaged and the debt is not repaid after maturity, the original owner of the car will commit theft if the ownership of the car is obtained based on the mortgage. If it is a pledged car, although the vehicle is legally occupied, the ownership of the vehicle is still the owner. Generally speaking, it is not considered a crime, and it can be considered as a breach of contract. You can file a civil lawsuit to ask the other party to repay in advance. Collateral means that the debtor or the third party does not transfer the possession of a certain property, but takes the property as the guarantee of creditor's rights. When the debtor fails to perform the debt, the creditor has the right to discount it according to law or give priority to compensation with the price of auction or sale of the property.

Legal basis: Article 394 of the Civil Code of People's Republic of China (PRC) guarantees the performance of debts. If the debtor or a third party mortgages the property to the creditor without transferring the possession of the property, if the debtor fails to perform the due debt or realize the mortgage according to the agreement of the parties, the creditor has the right to be paid in priority for the property.

The debtor or the third party specified in the preceding paragraph is the mortgagor, the creditor is the mortgagee, and the property that provides guarantee is the mortgaged property.