Deductions & credits

Did you type "Section 179, self-employed business "   in the search box?
There is no heading or section or question in Turbo Tax called Section 179.  You enter your vehicle information as I indicated above, and usage must be greater than 50% business use.  You have to go through all the questions.  At some point Turbo Tax will ask whether you want actual expenses, or standard mileage.  If you qualify, it will indicate about special depreciation or deduction allowable.   If you do not answer the questions correctly (to qualify for 179) it will not let you have it.