It sounds like you entered it in the correct place.
The amount you entered will be shown on Schedule A Itemized Deductions on line 5c. If you have additional taxes claimed in that section of Schedule A, such as state and local taxes or general sales tax, or real estate taxes, then the total amount is limited to $10,000 (or $5000 if Married Filing Separate). This means you may not see an additional benefit from entering the personal property tax on your vehicle if you have already reached the limit.
Additionally, if you are using the standard deduction, you will not see Schedule A included with your return or see a benefit on your taxes for entering the amount of personal property tax that you paid.
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