Can I sell my car under a joint ownership by myself?

It is possible to sell a car under joint ownership by yourself as long as you have authorization from the other owner. The easiest way to do this would be to obtain a power of attorney from the other owner that specifically gives you the authority to sell the car on their behalf. With this power of attorney in hand, you can proceed with the sale process as normal.

However, it's crucial to understand that the specifics and requirements for selling a jointly owned car may vary depending on the laws in your jurisdiction. For this reason, it's highly advisable to consult with an attorney or legal expert who is well-versed in vehicle and ownership laws in your area to ensure that you comply with all legal obligations and protect the rights of both owners involved.