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 MANUALSLEXUS1997ES 300 V6-3.0L (1MZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORTESTING AND INSPECTION
1997 Lexus ES 300 V6-3.0L (1MZ-FE)
Oxygen Sensor: Testing and Inspection
1997 Lexus ES 300 V6-3.0L (1MZ-FE)SECTION Testing and Inspection
HEATED OXYGEN SENSORS INSPECTION
1. Inspect heater resistance of heated oxygen sensors.
(Bank 1 Sensor 1, Bank 2 Sensor 1)
(a) Disconnect the oxygen sensor connector.
Bank 1 Sensor 1:
Bank 2 Sensor 1:
(b) Using an ohmmeter, measure the resistance between the terminals +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 (440 kgf.cm, 31 ft.lbf)
(c) Reconnect the oxygen sensor connector.
2. Inspect heater resistance of heated oxygen sensor.
(Bank 1 Sensor 2)
(a) Remove the driver's seat.
(b) Take out the floor carpet.
(c) Disconnect the oxygen sensor connector.
(d) Using an ohmmeter, measure the resistance between the terminals +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 (440 kgf.cm, 31 ft.lbf)
(e) Reconnect the oxygen sensor connector.
(f) Reinstall the floor carpet.
(g) Reinstall the driver's seat.
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.