If your visa has already expired and you are out of the country, unfortunately there isnt much you can do. If you had a valid visa, then you could have transferred the car to a friend, who can in turn sell it and send the money across to you.

The solution that I see in my limited experience is to contact your company and let them help you out by writing a letter to traffic to allow the confiscation and subsequent sale / or transfer of the vehicle to some one you nominate / or transfer under the company's name. They can in turn sell the vehicle and send the money to you. I am assuming the company would be at least consider this to help you out.

Other than this , I dont see much options available for you. Hope this helps.