Oxygen Sensor Heater
- A front oxygen sensor is used on exhaust pipe in front of catalytic converter and a rear oxygen sensor on exhaust pipe behind catalytic converter. Disconnect electrical connector from appropriate oxygen sensor and note oxygen sensor terminals. See Fig 1.
- Using ohmmeter, measure resistance between oxygen sensor terminals +B and HT. See Fig 1. Replace oxygen sensor if resistance is not within specs. See the OXYGEN SENSOR HEATER RESISTANCE SPECIFICATIONS table.
OXYGEN SENSOR HEATER RESISTANCE SPECIFICATIONS
| Application | Ohms @ 68°F (20°C) |
|---|---|
| Land Cruiser | 5-7 |