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Fit For:2004 Nissan Frontier 3.3L2004 Nissan Xterra 3.3L Descriptions: The oxygen sensor measures the amount of oxygen in the exhaust gasses that exit the engine. It sends real-time data about the amount of unburnt oxygen in the exhaust system to the engines computer to determine the correct air-to-fuel ratio for the cars engine. ? ???Can a bad O2 sensor cause loss of power?A faulty O2 sensor relays false readings to the computer causing inaccurate adjustments to your combustion engine’s i...

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