The Denso Oxygen Sensor 234-4545 is a new, unused product that comes in an open box. Known for their high-quality automotive parts, Denso is a trusted brand in the industry. This specific sensor is designed to measure the oxygen content in the exhaust gases of a vehicle, playing a crucial role in controlling the fuel injection system and reducing emissions. Perfect for car enthusiasts or mechanics looking to replace a faulty oxygen sensor, this product ensures precise measurements and reliable performance.