On Autotrader, "Cat D" refers to a car that has been written off by an insurance company due to damage that is less expensive to repair than replace. These cars can be repaired and put back on the road, but they may have a lower resale value than other models with similar age, mileage, history, and documentation. The damage to Cat D cars can be either existing or already repaired before the vehicle is put up for sale. It is important to note that the Cat D classification was replaced by the new Cat N category in October 2017, which focuses more on the condition of the car rather than the cost of repairing it. However, vehicles categorized as Cat D prior to October 2017 will remain as Cat D. Autotrader labels Cat D and Cat C cars as such, and private buyers may be unwilling to take the risk involved with buying a Cat D car, especially if the damage has not been repaired.