When you purchase a vehicle, sales tax is paid up front. So your down-payment AND sales tax would have been paid when your first bought your vehicle. Your paperwork should show your sales taxes paid.
That said, unless you itemize your deductions on Schedule A, you won't be allowed to deduct those sales taxes. Because the standard deduction has been increased at the end of 2018, many more people are using the standard deduction.
If you have further questions, please post back.
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*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
