The Nissan Xterra Oxygen Sensor does exactly what you think it would do. It monitors the amount of unburned oxygen in the exhaust gas so the engine control computer can adjust the air fuel mixture for proper performance and emissions. The Oxygen Sensor, mounted within a threaded steel shell in the exhaust stream, contains a zirconium dioxide element coated with platinum, which produces a variance in voltage from 0.1 to 0.9 volt as the mixture changes from lean to rich. The Oxygen Sensor's embedded heater rapidly elevates operating temperature to about 600°F for closed loop control shortly after start-up. Signals are sent continuously by the Oxygen Sensor upstream that cause changes in the injector pulse width several times per second. Downstream, there is another Oxygen Sensor that monitors the catalytic converter efficiency and when effective will be near 0.45 volts. If contamination or aging inhibits response time, raises emissions, and illuminates warning lights on your Nissan Xterra dashboard, the installation of a reactive unit will help you meet Nissan emission targets. Moreover, it will help the Xterra powertrain function smoothly while ensuring the fuel economy you expect from a Nissan Xterra.
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