2012 Toyota Prius TwoFACTORY OEM SERVICE PROCEDURE

Heated Oxygen Sensor: Inspection: Inspection

  1. INSPECT HEATED OXYGEN SENSORΒ 
    Fig 1: Inspecting Heated Oxygen Sensor
    GTY293036Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    TEXT IN ILLUSTRATION

    *a Component without harness connected
    (Heated Oxygen Sensor)
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (HT1B) - 2 (+B) 20Β°C (68Β°F) 11 to 16 Ξ©
      1 (HT1B) - 4 (E2) - 10 kΞ© or higher

      If the result is not as specified, replace the heated oxygen sensor.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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