Upstream means before the catalytic converter. Fords are funny. That year you could just have one. What was the code? Did it say bank 1 or bank 2? 1 is behind the radiator, 2 is behind the engine. Only 1 sensor, behind the engine in the exhaust manifold. Been a long time since I played with a 97 Ford.
O2s ( oxygen sensors) are always after the cat converter
heated oxygen sensors(HO2S a totally different operation)are always before the cat converter or in the exhaust manifold
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