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I cosigned for a friend who is not paying the payment
Another option, not yet discussed here, is to allow the loan to go into default and let the loaning agency repossess the property the loan was used for, after which they sell it and that sale should discharge some significant portion of the loan. Knowing where the friend and property is, you may be able to help them carry out the repossession by providing them information. Meanwhile, your credit will take a significant hit, but unless your name is on the deed/title of the property then you have little claim that the property is yours just because you're paying the loan. The contract you signed for the loan is not going to be easily bypassed with a lawsuit of any sort, so unless you can produce another contract between you and your friend it's unlikely that you can even sue them. In short, you have no claim to the property, but the loaning agency does - perhaps that's the only way to avoid paying most of the debt, but you do trade some of your credit for it. Hopefully you understand that what you loaned wasn't money, but your credit score and earning potential, and that you will be more careful who you choose to lend this to in the future.