Legal Question in Civil Litigation in Maryland

If you get sued by the lender for a deficiency after they sell the vehicle, you can sue your ex for contribution and/or indemnification. As for your agreement regarding him turning over the vehicle, unfortunately it's a little too late for that, since it's been re-po'ed by the lender. If the lender elects just to charge it off and not come after you, your loss (no small one) is the damage to your credit, which is difficult to quantify in a suit against your ex. Your other option, which as you note isn't a good one, is to pay off the loan if you can get the car back, sell the car if it's saleable and then sue him for the difference. In the final analysis, unless he's getting a regular paycheck or has significant assets, you probably wouldn't be able to collect from him anyway.