Your vehicle's O2 sensor plays a significant role in its performance and if it's faulty, it's not something you should ignore. Here's what you need to know.

What is Estimated Oxygen Variation? Estimated Oxygen Variation is a reading of the oxygen levels in your blood. This is done via the SpO2 sensor, which is a red LED in the optical heart rate monitor.

Your vehicle's O2 sensor plays a significant role in its performance and if it's faulty, it's not something you should ignore. Here's what you need to know.