Get your taxes done using TurboTax

Ok, the easiest thing to do would be to Delete that Asset Entry Worksheet from your return.

Business Vehicles should go on the Vehicle Expenses Worksheet.  

Then, in Business Expenses, enter the Vehicle in the Vehicle Expenses section.  You will be asked when you started using it for business, the Cost of the Vehicle, the FMV when you started using it, the Date you Stopped Using it, and current year expenses.

You will be asked Sales Price (trade-in amount received) and the Prior 179 Deduction Amt (screenshots).  

Hopefully this will eliminate your error.