Cars these days are run almost entirely by an onboard computer called the ECU, and most components of the car are operated by sub-electronics connected to that ECU. The ECU and sub-components are usually custom to the make and model, any sub-component not functioning as expected will often trigger the ECU to not allow the car to start. Modern cars also record all driver actions and engine data to a 'black box' that can be used against the driver by insurance. They also have cell network transceivers that phone home arbitrary data to the manufacturer. Everything is integrated intentionally in such a way that modifying anything has the potential to break everything.
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