OEM INFINITI Oxygen Sensors

Your INFINITI car or SUV came from the factory with a factory-installed oxygen sensor for a good reason. The oxygen sensor, also called a lambda sensor, measures the oxygen levels in the exhaust gases. The sensor transmits that information back to the engine control unit (ECU), which makes adjustments as needed to keep the engine running right.

How Oxygen Sensors Work

Most vehicles actually feature at least two oxygen sensors, if not four. One sensor is located in front of the catalytic converter, while the other(s) are situated in each exhaust manifold. The sensor placed ahead of the catalytic converter (or the upstream sensor) monitors the engine's burning efficiency. That data gets sent to the ECU, which calculates the optimal air-to-fuel ratio needed for both power and efficiency. The ECU also compares readings from the sensor in the manifold to the upstream reading to ensure they match. If they don't, a diagnostic code may get triggered.

How to Recognize a Faulty Oxygen Sensor

When oxygen sensors go bad, the ECU is forced to guess the ideal air-to-fuel ratio. That can lead to problems with your engine or catalytic converter. Signs of failure include:

• Reduced fuel efficiency
• You detect the odor of rotten eggs
• Rough idling engine
• Failed emissions tests
• Your "Check Engine" dash light comes on

Genuine INFINITI Oxygen Sensors are Your Best Option

If your oxygen sensors do go bad, replace them as soon as possible to avoid even more expensive repairs. After all, a $300 oxygen sensor is a lot more affordable than a catalytic converter than can run you more than $1,000 -- or an even costlier engine repair. When you shop our online INFINITI auto parts catalog, you save even more as we offer our parts at prices up to 35% below MSRP. That's why it's smart to buy the right oxygen sensor for your model: one made by your OEM specifically for your model. Buy today and we'll get your order shipped right out.