In every year of production, the LS 430 was the most reliable luxury sedan in the J.D. Power and Associates Initial Quality Survey (with the early and late models of this series the best performing), and the highest recorded scorer in the history of J.D. Power's Vehicle Dependability Survey. Thatcham ratings data via the UK Motor Insurance Repair Research Centre listed the theft-prevention capabilities of the LS 430 as a maximum 5 stars, with the LS 430 being the first automobile to achieve the maximum theft-deterrence rating in 2001.