Heated Oxygen Sensor.
Oxygen Sensor.

• Monitors the air-to-fuel ratio within your engine
• Can become worn over time or damaged by a fluid leak
• Replacement by an INFINITI professional is recommended

Your vehicle's combustion system depends on numerous sensors and gauges to maintain optimal conditions for performance. One of these mechanisms is the O2 sensor. Originally, these sensors were invented to help limit emissions, and are now standard in most modern vehicles. Depending on the INFINITI model and year you own, you may have one or more of these in your engine.

Your Oxygen Sensor (Rear)s help measure the air-to-fuel ratio in your engine, helping your engine's internal computer regulate the mixture depending on whether your engine is running on too little oxygen (burning rich) or too much oxygen (burning lean). Having the incorrect ratio of air-to-fuel may negatively affect the combustion engine, resulting in poorer fuel efficiency and more emissions. That's why it's a good idea to have a new INFINITI O2 sensor.

The Oxygen Sensor (Rear) produces electricity, and the amount of voltage it results in depends on what the exhaust system is producing. In layman's terms, the electricity generated by your INFINITI O2 sensor will vary if the fuel-air mixture is off! When the system notices a change in voltage, your engine's internal computer makes adjustments to the fuel mixtures to keep your INFINITI running as intended.

Your INFINITI Oxygen Sensor (Rear) may need to be replaced after a period of time or usage. In some cases, you may need to replace it prematurely if your INFINITI sensor is damaged by coolant or oil leaks, or other forms of contamination. Some telltale signs that indicate the need for a new INFINITI sensor include: engine misfiring, rough idling, poor gas mileage, and a check engine light.

Since the majority of modern cars rely on multiple O2 sensors to support proper combustion, it can be challenging for an at-home mechanic to pinpoint which one requires replacement! Occasionally, the repair involves at a specialized scanner and inspecting the undercarriage by jacking up the vehicle. That's why many INFINITI owners opt for getting Oxygen Sensor (Rear) repairs at their local INFINITI service center.

Is one or more of your INFINITI Oxygen Sensor (Rear)s misfiring? Order an authentic Oxygen Sensor (Rear) for your INFINITI QX56 for precise fitment and performance. Check the What This Fits tab for more details.

Fits QX56