No. Only the lender can "repossess" a vehicle. You need to keep making the payments to protect your own credit. It is likely you would need to bring a court action, prove you are making the payments and petition the court to order a transfer of title.
Unless you are listed on the TITLE as co-owner, NO.
No. You are the primary borrower and are honoring your financial obligation.
No, but if the borrower misses enough payments, the cosigner will start getting collection calls as well.
Only if the cosigner is also named on the vehicle title.
No. If you are not on the deed, you can't sell the property. The only "right" you have as a cosigner is the obligation to make the payments.
When the primary borrower defaults the cosigner becomes legally responsible for the loan. If the cosigner is not able to pay the loan he or she can also be subject to legal action by the lender and the cosigner's credit score will be seriously affected.
The primary borrower is responsible for making the payments and adhering to the terms of the lending contract. The cosigner is legally obligated only if the primary borrower defaults on the lending agreement or files bankruptcy (chapter 7).
It wouldn't be a repossession, but if he has had to make the payments, he could sue the primary borrower and might get possession from the court.
The only way for a co-signer to be taken off the loan, would be for the primary borrower to refinance the account.
If you are a co-signer of a repossesion, and the primary borrower has not made an attempt to make their payments then you are fully responsible for this debt.
Only if the primary has said s/he will surrender the property in the bankruptcy and/or if the cosigner does not make the payments due.