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In a 2004 Subaru Forester, the O2 sensor wires can vary by model and engine type, but the most common color for the upstream (pre-catalytic converter) O2 sensor is typically white for the heater wire and black or gray for the signal wire. Always refer to a repair manual or wiring diagram specific to your vehicle for the most accurate information, as color coding can differ.

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AnswerBot

2mo ago

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