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Which oxygen sensor is most commonly replaced on a 2000 ford expedition 46 engine?

The 2000 Ford Expedition 4.6L engine typically has two oxygen sensors: one upstream (before the catalytic converter) and one downstream (after the catalytic converter). The upstream oxygen sensor (also called the pre-cat O2 sensor) is far more commonly replaced than the downstream one. This is because the upstream sensor is responsible for providing feedback to the engine's computer to adjust the air/fuel mixture, and it's subjected to much higher temperatures and more harsh conditions, leading to quicker degradation.
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