Tl* the contact owns a 2009 lexus is250. the contact stated that the vehicle lunged and then accelerated independently. the failure was experienced several times. on one occasion, the failure occurred immediately after start-up and the vehicle accelerated into a neighbor's driveway. the vehicle was taken to the dealer several times for the failure. a diagnostic was performed, but the dealer was unable to determine the failure. the manufacturer was made aware of the failure. the vehicle was not repaired. the approximate failure mileage was 9,000 and the current mileage was 44,000. updated 7/29/13 *cn the consumer stated the vehicle failed to stop at a stop sign, then lunged forward about 10-12 feet. the brakes did not work, even though she pushed the brake to the floor for several minutes. finally, the vehicle stopped in the middle on the intersection.