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4 CHECK HEATED OXYGEN SENSOR 1 HEATER (FRONT)
1. Stop engine.
2. Check heated oxygen sensor 1 (front) harness protector color.
SEF505Y
3. Check resistance between HO2S1 (front) terminals 3 and 1.
AEC158A
Resistance: 2.3 - 4.3Ω at 25°C (77°F)
4. Check continuity between HO2S1 (front) terminals 2 and 1, 3 and 2.
Continuity should not exist.
CAUTION:
쐌 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.
쐌 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.
OK or NG
OK (With CONSULT-II) 䊳 GO TO 5.
OK (Without CONSULT-
II)
䊳 GO TO 6.
NG 䊳 Replace malfunctioning heated oxygen sensor 1 (front).
DTC P0131, P0151 HEATED OXYGEN SENSOR 1 (FRONT)
(BANK 1)/(BANK 2) (LEAN SHIFT MONITORING)
VG33E
Diagnostic Procedure (Cont’d)
EC-794
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