The Delphi Oxygen Sensor - ES20173 is a high-quality automotive sensor designed to measure the oxygen levels in a vehicle's exhaust system. It is made by Delphi, a reputable manufacturer known for producing reliable and durable automotive parts. This sensor is essential for ensuring proper fuel-to-air ratio in the engine, which is crucial for optimal performance and fuel efficiency. It is compatible with a wide range of vehicle makes and models and is easy to install. The Delphi Oxygen Sensor - ES20173 is a reliable and cost-effective solution for monitoring and maintaining the vehicle's emissions.