The DENSO Oxygen Sensor, also known as an O2 sensor, showcases superior engineering for optimal performance. Symptoms of a faulty or bad oxygen sensor include bad gas mileage, rough idle, reduced drivability, and an illuminated check-engine light.
About the only things I can say about the sensor is it is quality made and works great so far. I don't drive my vehicle much so I can't really give a valid history of its performance but if I needed another I would sure go with this one again.