Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p0151 a/f / o2 sensor circuit low voltage bank 2 sensor 1

Subaru Legacy BN/BS (2015-2019) Service Manual / Engine (diagnostics)(h6do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0151 a/f / o2 sensor circuit low voltage bank 2 sensor 1

DTC DETECTING CONDITION:

Immediately at fault recognition

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mode > PROCEDURE.

WIRING DIAGRAM:

• Engine Electrical System ENGINE TYPE EZ (WITHOUT PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

• Engine Electrical System ENGINE TYPE EZ (WITH PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK FRONT OXYGEN (A/F) SENSOR CONNECTOR AND COUPLING CONNECTOR.	Has water entered the connector-	Completely remove any water inside.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0151 A/F / O2 SENSOR CIRCUIT LOW VOLTAGE BANK 2 SENSOR 1
2.CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. 1) Turn the ignition switch to OFF. 2) Disconnect the connectors from ECM and front oxygen (A/F) sensor. 3) Measure the resistance between ECM connector and chassis ground. Connector & terminal (E158) No. 45 — Chassis ground: (E158) No. 44 — Chassis ground:	Is the resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0151 A/F / O2 SENSOR CIRCUIT LOW VOLTAGE BANK 2 SENSOR 1	Repair the short circuit to ground in harness between ECM connector and front oxygen (A/F) sensor connector.
3.CHECK FOR POOR CONTACT. Check for poor contact of the front oxygen (A/F) sensor connector.	Is there poor contact of front oxygen (A/F) sensor connector-	Repair the poor contact of front oxygen (A/F) sensor connector.	Replace the front oxygen (A/F) sensor. Front Oxygen (A/F) Sensor

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P0131. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0131 A/F / O2 SENSOR CIRCUIT LOW VOLTAGE BANK 1 SENSOR 1

Dtc p0152 a/f / o2 sensor circuit high voltage bank 2 sensor 1

DTC DETECTING CONDITION:Immediately at fault recognitionCAUTION:After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mod ...

Dtc p014f a/f / o2 sensor slow response - lean to rich bank 2 sensor 1

NOTE:For the diagnostic procedure, refer to DTC P014E. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P014E A/F / O2 SENSOR SLOW RESPONSE - RICH TO LEAN BANK 2 SENSOR 11. OUTLINE OF DI ...

Other materials:

Inspection
• Check the transmission case for damage.• Check for leakage of CVTF from the connection between converter case and transmission case.• Check for leakage of CVTF from the connection between intermediate case and transmission case.• Check the lubrication pipe for bend or damag ...