Since I have had the car, I will hear a ticking noise seemingly coming from the driver side rear of the car. It sounds like something attached to the rear wheel that hits part of the body every revolution. It is easier to hear when the car is in EV mode. At first I thought something was caught in the caliper, but I could not find anything. Could it be perhaps a sound meant to alert people that you are approaching? I thought I had seen it discussed elsewhere but have been unable to find a reference.