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Component Inspection

CHECK HEATED OXYGEN SENSOR 3 HEATER

Turn ignition switch OFF.
Disconnect heated oxygen sensor 3 harness connector.

Check resistance between HO2S3 terminals as follows.

TERMINALS RESISTANCE REFERENCE

Terminal	Resistance
2 and 3	3.4 - 4.4 Ω [at 25°C (77°F)]
1 and 2, 3, 4	∞ Ω (Continuity should not exist)
4 and 1, 2, 3	∞ Ω (Continuity should not exist)

Is the inspection result normal?

YES: INSPECTION END

NO: GO TO 2.

REPLACE HEATED OXYGEN SENSOR 3
Replace heated oxygen sensor 3.
CAUTION:
- Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
INSPECTION END