Selling property is a taxable capital gain if the selling price is more than your cost basis. For personal property not used in business, your cost basis is what you paid (including the warranty), so the buyout will not be taxable income unless you paid less than $9400 for the jeep in the first place.
For property used in business, or partly in business, your cost basis is reduced by depreciation you claimed or could have claimed. This includes using the car for business (deliveries, rideshare, anything else) where you used the exact expense method or the standard mileage method, because both methods include depreciation. If the vehicle was used in business, you have to treat it as the sale of a business asset, with the price as your starting basis, minus any adjustments for depreciation, which could result in part or all of the sales proceeds being taxable depending on how much business use there was.
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