SALES TAX
You can enter the sales tax you paid for the car you purchased in 2016 by going to Federal>Deductions and Credits>Estimates and Other Taxes Paid> Sales Tax. You will be asked if you paid sales tax on a major purchase, and you will be able to enter the sales tax you paid for your new vehicle.
Sales tax is an itemized deduction. If your state has a state income tax, you have to choose between using the deduction for your state tax paid OR the sales tax deduction, whichever is higher. The TT process will suggest one or the other as you prepare your return
That being said, you are posting from the Free version of TurboTax which does not support itemized deductions. In order to itemize your deductions, you need an upgraded version of TT such as Deluxe (or higher). If you do not have enough other deductions to itemize, then your sales tax will not affect your refund or tax due. You will just receive the standard deduction.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
