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 HEATED OXYGEN SENSOR (BANK 1 SENSOR 1)
- Disconnect the oxygen sensor connector.
- Using an ohmmeter, measure the resistance between the terminals +B and HT.
Resistance:
- 1ZZ-FE: 5 - 10 Ω at 20°C (68°F)
- 2ZZ-GE: 11 - 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, 31 ft.lbf)
- Reconnect the oxygen sensor connector.
- INSPECT HEATER RESISTANCE OF HEATED OXYGEN SENSOR (BANK 1, SENSOR 2)
- Remove the passenger's seat.
- Take out the floor carpet.
- Disconnect the oxygen sensor connector.
- Using an ohmmeter, measure the resistance between the terminals +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, 31 ft.lbf)
- Reconnect the oxygen sensor connector.
- Resistance the floor carpet.
- Reinstall the passenger's seat.
NO RELATED
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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.