 Euro NCAP scores were the maximum five stars in Adult Occupant, four stars in Child Occupant, and two of four stars in Pedestrian test categories.The Insurance Institute for Highway Safety gives the Lexus IS sedan a "Good" overall score for both front and side impact tests, and also ranks the IS "Good" in all fourteen measured categories in the front and side impact crash tests.For the IS 250, IS 350, and IS F, engines feature the manufacturer's D-4S direct injection system; these models are ULEV-II emission certified in the United States by the California Air Resources Board.