I have seen the same thing happen with mortgage companies what refused to change title over even though people had their loans discharged in bankruptcy and the homeowner left the house. They were still liable for city violations and HOA fees. Go back to divorce court and ask the judge to order the ex to pay the fines and tickets. You could also ask the judge to issue an order to the MVD to remove your name from the title of the vehicle.
To escape any liability for an automobile which you do not have possession subsequent to a divorce, you need to do more than surrender your interest in a BK. Should your ex spouse maintain control, you will need to seek court assistance via an order to the proper state authority to remove you from title. Consulting a family law attorney would serve you well.
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