Kwiksen Oxygen O2 Sensor 234-4372 Upstream For 2007-2010 Mazda CX-9 3.5L 3.7L COMPATIBLE WITH OEM: 234-4372, CY01-18-861 Length (Sensor to Lead): 300mm. Wires: 4 Meet the professtional specification as OEM parts, for stable performance & durability Warranty: 1 year unlimited miles. Please check the description or use the year/make/model drop down bar and interchangeable part numbers to confirm the compatibility before purchase.