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EC-254 [QG (WITH EURO-OBD)] DTC P0138, P0158 HO2S2 (A/T MODELS) 4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least one minute under no 5. Let engine idle for two minutes. 6. If 1st trip DTC is detected, go to EC-258, "Diagnostic Procedure" . WITH GST 1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch “OFF” and wait at least 10 seconds. 3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least one minute under no 4. Let engine idle for two minutes. 5. Turn ignition switch “OFF” and wait at least 10 seconds. 6. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least one minute under no 7. Let engine idle for two minutes. 8. Select “Mode 3” with GST. 9. If NG, go to EC-258, "Diagnostic Procedure" . ● When using GST, “DTC Confirmation Procedure” should be performed twice as much as when SEF174Y |