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 INFINITI's combustion engine relies on numerous sensors and gauges to maintain the environment required for proper performance. One of these mechanisms if the Oxygen Sensor (Rear). Originally, Oxygen Sensor (Rear)s were rolled out to reduce emissions, and are now standard in most modern vehicles. Depending on your INFINITI model and year, your combustion engine may rely on one or more of these.

The Oxygen Sensor (Rear)s help gauge the air-to-fuel mixture, working with the internal computer to regulate the ratio depending on whether your engine is burning rich (too little oxygen) or burning lean (too much oxygen). An “off” air-to-fuel ratio can negatively impact the combustion system, resulting in poorer fuel efficiency and an increase in emissions. That's why it's smart to get a high-quality INFINITI Oxygen Sensor (Rear).

An Oxygen Sensor (Rear) produces an electric charge, and the amount of voltage it results in depends on what's coming out of the exhaust system. In other words, the electricity generated by your INFINITI Oxygen Sensor (Rear) varies if the air-to-fuel ratio is off. When the system notes a variance in voltage, your vehicle's onboard computer makes the necessary adjustments to keep it running as designed.

Your Oxygen Sensor (Rear) may need to be replaced after a period of time or usage. In some cases, your car may need a premature O2 sensor replacement if it's damaged due to leaks or other forms of contamination. Some potential signs that it's time for a new INFINITI sensor include: engine misfiring, rough idling, decreased gas mileage, and an illuminated dashboard warning light.

Since the majority of modern cars rely on not one but multiple Oxygen Sensor (Rear)s to support proper combustion, it can be challenging for a DIY mechanic to diagnose and replace the right sensor on their own. Sometimes, the repair involves at a specialized scanner and jacking the vehicle up to get to the undercarriage. That's why many INFINITI owners opt for getting O2 sensor replacement services from their local INFINITI experts.

Is one or more of your INFINITI Oxygen Sensor (Rear)s misfiring? Order an authentic Oxygen Sensor (Rear) for your INFINITI QX50 for precise fitment and performance. Check the What This Fits tab for more information.

Fits QX50, QX55