Description of Incident: While operating the vehicle with FSD engaged, the system was traveling at the posted speed limit of 25 mph. Without warning, it suddenly made a sharp left turn onto the sidewalk and accelerated during the maneuver. A pole on the left side struck the vehicle, damaging the driver-side mirror, scratching and denting the body, and leaving the left rear door unable to open properly. This was the third time FSD had been used since purchasing the car less than 24 hours prior. The system did not allow manual override of the wheel at the time of the incident. After the impact, once the vehicle returned to the road, it came to a stop and FSD disengaged on its own. Notes: No pedestrians or other vehicles were in the immediate area, preventing further harm. No system warnings or alerts were issued before or during the incident. The incident is attributed to a malfunction of the FSD system.