No, the engine would not emit carbon dioxide. Currently electric engines and batteries only emit heat. The byproducts of the reaction do not involve carbon dioxide and are self contained within the battery.
The car itself might emit some CO2 from the friction on the tires as it drives, but the amount would be negligible.
That being said, electric cars are not free from emissions. The mineral extraction and production process does produce CO2 and the energy needed to charge the car produces CO2 until we can switch entirely to a green power source like nuclear.
Although to a lesser extent then with a combustion engine there is still some pollution from electric cars as well. There is friction from both the tyres and the brakes releasing dust particles from the asphalt, rubber and brake pads. Most of this is in the form of dust particles but it will brake down into things like carbon dioxide over time. These particle emissions can be much higher for electric vehicles then for combustion vehicles. Firstly because unlike emissions from the exhaust which can be filtered and regulated properly emissions from tyres and brakes is much harder to fix and because electric vehicles tends to be heavier then combustion vehicles they have more friction and therefore release more of these particles.
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