; and (ii) prevent the use of such vehicle until the defect or noncompliance has been remedied as required under section 30120 of such title; and (3) the head of the agency shall make all reasonable efforts to prevent the use of such vehicle by individuals of the agency until the defect or noncompliance has been remedied as required under section 30120 of such title, unless the head of the agency makes a written determination that use of the vehicle by individuals of the agency is necessary for a critical mission purpose and that such purpose outweighs any risks to health and safety caused by using the vehicle before the defect or noncompliance is remedied as required under section 30120 of such title. (b) Motor vehicles leased by Federal agencies If an entity notifies the head of an agency of the Federal Government that such entity has received a notification under section 30119 of title 49, United States Code, that a vehicle leased by the entity to the head of the agency, or an item of replacement equipment used in or on the vehicle, contains a defect related to motor vehicle safety or does not comply with an applicable motor vehicle safety standard prescribed under chapter 301 of such title, the head of the agency shall make all reasonable efforts to prevent the use of such vehicle by individuals of the agency until the defect or noncompliance has been remedied as required under section 30120 of such title, unless the head of the agency makes a written determination that use of the vehicle by individuals of the agency is necessary for a critical mission purpose and that such purpose outweighs any risks to health and safety caused by using the vehicle before the defect or noncompliance is remedied as required under section 30120 of such title.