Frequently Asked Questions - NTK Oxygen Sensors

Q: What does an Oxygen Sensor do?
Q: When do I need to change my Oxygen Sensor?
Q: Why do I need to change my Oxygen Sensor?
Q: Does an Oxygen Sensor fail?
Q: What is OBD II, and why is it important?
Q: What do the wire colors represent?
Q: What is a "Universal" oxygen sensor?
Q: What effect do fuel additives and injector cleaners have on Oxygen Sensors?