You can easily find motor vehicle expenses in the Statement of Business or Professional Activities. To find the section:
> Log into TurboTax Online, choose your tax return for the year
> On the left navigation pane, choose Income, then Self-Employment, then Business or Professional Activities
> Here you will choose the "Edit" button beside the business you are looking to report vehicle expenses to
> You will then go to "Motor Vehicle Expenses (Including interest and leasing costs)"
> Here you may add a vehicle for business use or just a vehicle along with all the information associated.
Make sure to hit the Continue button so that your information is saved.
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