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Bank # 1 is the passenger side of the engine in a Ford Expedition

Sensor # 1 would be before the catalytic converter ( upstream sensor )

Sensor # 2 would be after the catalytic converter ( downstream sensor )

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Q: Where is bank 1 sensor on 2004 Ford Expedition?
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Bank 2 is the drivers side of the engine in a Ford Expedition Sensor 2 is after the catalytic converter ( downstream )


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