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1. Turn ignition switch OFF.
2. Check heated oxygen sensor 1 (front) harness protector.
SEF505Y
3. Disconnect corresponding heated oxygen sensor 1 (front) harness connector.
WEC545
4. Disconnect ECM harness connector.
5. Check harness continuity between ECM terminal and HO2S1 terminal as follows.
Refer to Wiring Diagram.
SEF817Z
Continuity should exist.
6. Check harness continuity between ECM terminal or HO2S1 terminal and ground as follows.
Refer to Wiring Diagram.
SEF818Z
Continuity should not exist.
7. Also check harness for short to power.
OK or NG
OK 䊳 GO TO 7.
DTC P0133, P0153 HEATED OXYGEN SENSOR 1 (FRONT)
(BANK 1)/(BANK 2) (RESPONSE MONITORING)
VG33E
Diagnostic Procedure (Cont’d)
EC-814
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