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Re: oxygen sensors
Oxygen sensors react to changes in fuel mixture. They react from rich to lean, and from lean to rich. The faster the sensor can react to changes, the faster the ECM can adjust fuel mixture and the better your fuel mileage will be. Oxygen sensor reaction time slows down during its life. At 100,000 miles the reaction time has slowed enough to significantly affect fuel mileage. Ideally all three sensors should be replaced. The data from both upstream, (front) sensors is used by the ECM to determine fuel mixture. Data from the downstream sensor, (after the converter) is used only to monitor the performance of the converter.
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