Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Heated Oxygen Sensor: Inspection
- INSPECT HEATER RESISTANCE OF OXYGEN SENSOR
- Disconnect the sensor connector.
- Using an ohmmeter, measure the resistance between terminals +B and HT.
Resistance: 11 to 16 Ω at 20°C (68°F)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If the resistance is not as specified, replace the sensor.
Torque: 44 N.m (450 kgf.cm, 32 ft.lbf)
- Reconnect the sensor connector.
- INSPECT OPERATION OF HEATED OXYGEN SENSOR (See DTC P0136: OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2) )
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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