Maybe Electrical Engineering or ELECTRONICS AND TELECOMMUNICATIONS. Along with your academic course, start reading ROS ie Robot Operating System, Aritifcal Intelligence and topics like Machine Learning, too. These things will surely help you learn things related to car.. You can also go for learning about driverless cars if you prepare yourself even harder by learning Courses like Ethical Technology, some languages like Python, Java, etc too.
Best wishes. Thank-you.
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