The Denso DOX-0506 is a direct-fit lambda (oxygen) sensor, also known as an O2 sensor, designed for use in vehicles, particularly Lexus and Toyota models. It's a crucial component for engine performance and fuel efficiency, ensuring the correct air-fuel mixture by measuring the oxygen content in the exhaust. Key Features and Characteristics: Direct Fit: Designed to be a plug-and-play replacement for the original equipment (OE) sensor. Heated and Broadband: Typically a heated sensor, meaning it has a heating element to quickly reach operating temperature, and a broadband sensor, which provides a wider range of measurement. Thread Size: M18x1.5. Number of Pins: Usually 4 pins. Cable Length: Can vary, but the DOX-0506 is often around 290mm.