Enter whatever percentage is correct for business use. Even though you no longer use it for business, you should enter the historical number.
Are you entering the vehicle for the first time on this tax return? If so, follow the entry screens carefully. TurboTax should accurately calculate the total accumulated depreciation for the asset. You won't enter any depreciation other than special depreciation (if you claimed that in the first year). You should not have any depreciation expense in the year of the sale.
Be sure you're entering the ending book balance as the sales price ($4,000 in your example).
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