In the Vehicle Expenses section for your Business that carried over from 2018, indicate that you 'stopped using the vehicle for business' and enter date of May 2019.
For Sales Price, enter $0 if you received no insurance reimbursement. If you did receive insurance money, enter that amount as Sales Price.
Enter your car rental fees, etc. as Sales Expenses.
You may have a deductible Business Loss that TurboTax will enter for you.
Click this link for more info on Removing Business Vehicle.
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