1999-2012 Mazda Mass Air Flow Sensor. Part number 74-50009Z. Replacement for 1999-2012 Mazda 3 5 6 MX-5 Miata Protege 1.6L 1.8L 2.0L 2.3L 2.5L L4 & Mazda 6 3.0L 3.7L V6 & Mazda RX-8 1.3L R2. New in box. Another example of some of the random parts we end up with when purchasing parts collections from people.