If your business percentage varied from year to year, unfortunately, TurboTax does not support that situation.
Entering the sale in the vehicle section is problematic because it assumes your current-year business percentage is the average percentage of its entire life, which is almost never the case. Unless you really know how to manipulate the numbers, it will give an incorrect gain/loss.
Manually calculating and entering the sale in the "Sale of Business Property" section can result in the correct gain/loss, but the last I checked it does NOT correctly affect things like QBI, the Home Office limit and some other things.
