Opened box never used brand new. The product is a new Denso O2 oxygen sensor designed for Lexus vehicles such as the IS250, IS350, GS430, and GS350. It is a direct replacement part with the manufacturer part number 234-4521. The sensor is a 4-wire type and is located downstream on the right side of the vehicle. Made in the United States, this oxygen sensor is a high-quality component designed to ensure proper function and performance in the vehicle's exhaust system.