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Heated Oxygen Sensor: Inspection

  1. INSPECT HEATER RESISTANCE OF HEATED OXYGEN SENSORS 
    1. Disconnect the oxygen sensor connector.
    2. Using an ohmmeter, measure the resistance between terminal +B and HT.

      Resistance: 11 - 16 Ω at 20°C (68°F) 

      If the resistance is not as specified, replace the sensor.

      Torque: 

      44 N.m (450 kgf.cm, 32 ft.lbf) for sensor 1 

      20 N.m (200 kgf.cm, 14 ft.lbf) for sensor 2 

    3. Reconnect the oxygen sensor connector.
  2. INSPECT OPERATION OF HEATED OXYGEN SENSORS (See  DTC P0130: OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR CIRCUIT (BANK 1 SENSOR 1), DTC P0150 OXYGEN SENSOR CIRCUIT (BANK 2 SENSOR 1), DTC P2195 OXYGEN SENSOR SIGNAL STACK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN SENSOR SIGNAL STACK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN SENSOR SIGNAL STACK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN SENSOR SIGNAL STACK RICH (BANK 2 SENSOR 1)  and  DTC P0136: OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2), DTC P0156 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 2 SENSOR 2)  ) 
    Fig 1: Inspecting Heater Resistance Of Heated Oxygen Sensors
    G03076949Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002