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There should be ( 2 ) upstream oxygen sensors Bank 1 - Sensor 1 - which is for the passenger side of the engine , somewhere in the exhaust pipe near the engine and before the exhaust enters the catalytic converter and Bank 2 - Sensor 1 - which is for the drivers side of the engine , also in the exhaust pipe before the exhaust enters the catalytic converter

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Q: Where is the upstream oxygen sensor on a 2004 ford explorer?
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