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:

Removal
NOTE:Before conducting this procedure, drain the engine oil completely.1. Remove the engine from vehicle. Engine Assembly > REMOVAL2. Remove the crank pulley. Crank Pulley > REMOVAL3. Remove the chain cover. Chain Cover > REMOVAL4. Remove the timing chain assembly. Timing Chain Assembly > REMOVA ...