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.
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HOMESERVICE MANUALSLEXUS2004LX 470 V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORTESTING AND INSPECTION
2004 Lexus LX 470 V8-4.7L (2UZ-FE)
Oxygen Sensor: Testing and Inspection
2004 Lexus LX 470 V8-4.7L (2UZ-FE)SECTION Testing and Inspection
INSPECTION
1. INSPECT HEATER RESISTANCE OF HEATED OXYGEN SENSORS
a. Disconnect the oxygen sensor connector.
b. Using an ohmmeter, measure the resistance between terminal +B and HT.
Resistance: 11 - 16 Ohm 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
c. Reconnect the oxygen sensor connector.
2. INSPECT OPERATION OF HEATED OXYGEN SENSORS
1. INSPECT HEATER RESISTANCE OF HEATED OXYGEN SENSORS
a. Disconnect the oxygen sensor connector.
b. Using an ohmmeter, measure the resistance between terminal +B and HT.
Resistance: 11 - 16 Ohm 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
c. Reconnect the oxygen sensor connector.
2. INSPECT OPERATION OF HEATED OXYGEN SENSORS
RENDER: 1.0x
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.