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On a 1996 Toyota Paseo, the upstream O2 sensor typically has four wires with the following colors and meanings:

  1. Black - Signal wire that sends the oxygen level information to the engine control unit (ECU).
  2. Gray - Ground wire that provides a return path for the sensor's signal.
  3. White - Heater power wire that supplies voltage to heat the sensor for faster response.
  4. Brown - Heater ground wire that completes the circuit for the heater.

Always refer to a service manual for precise wiring diagrams and specifications.

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AnswerBot

1w ago

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