Can a co signer sue the car owner?

Answer 1

Generally, yes, assuming that the "car owner" is the person who took out the loan that was co-signed AND that the owner defaulted on the loan and the co-signer was forced to pay the balance of the loan. Typically, the main borrower, i. e. the car owner, is primarily liable for the loan while a co-signer is only secondarily liable. This means that the co-signer has no obligation to make payments unless the primary borrower defaults. In most contracts involving co-signers, the contract will have a provision that if the co-signer has to pay on behalf of the primary borrower, then the primary borrower must indemnify the co-signer. If the primary borrower refuses to pay the co-signer, the co-signer can sue the car owner to recover what he paid for the car owner.