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I'M NOT A MECHANIC but if I'm reading the engine wiring schematic correctly, the orange wires connected to the oxygen sensor(s) , connect to a gray/red wire which ties in the oxygen sensors to the DPFE sensor ( differential pressure feedback EGR sensor) which in turn is connected to the PCM (powertrain control module)

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โˆ™ 2007-12-09 02:06:01
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Q: What does the orange wire do leading to the o2 sensor on a 99 ford explorer?
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