To prove liability for a car accident (leased or not), you must show: The at-fault party had a duty of care. This includes taking reasonable actions to avoid causing an accident that would result in injury to you or damage to your car. A breach in the duty owed by the at-fault party occurred. This breach occurs when they fail to avoid an accident. Actions that fail to protect others include distracted driving, impaired driving, speeding, or failure to yield. This breach caused the accident that injured you and damaged the vehicle you leased.