Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p2198 a/f / o2 sensor signal biased/stuck rich bank 2 sensor 1

Subaru Legacy BN/BS (2015-2019) Service Manual / Engine (diagnostics)(h6do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p2198 a/f / o2 sensor signal biased/stuck rich bank 2 sensor 1

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

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 P2198 A/F / O2 SENSOR SIGNAL BIASED/STUCK RICH 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 connector from ECM. 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 P2198 A/F / O2 SENSOR SIGNAL BIASED/STUCK RICH BANK 2 SENSOR 1	Repair the short circuit to ground in harness between ECM connector and front oxygen (A/F) sensor connector.
3.CHECK OUTPUT SIGNAL FOR ECM. 1) Connect the connector to ECM. 2) Turn the ignition switch to ON. 3) Measure the voltage between ECM connector and chassis ground. Connector & terminal (E158) No. 45 (+) — Chassis ground (−):	Is the voltage 4.5 V or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2198 A/F / O2 SENSOR SIGNAL BIASED/STUCK RICH BANK 2 SENSOR 1	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2198 A/F / O2 SENSOR SIGNAL BIASED/STUCK RICH BANK 2 SENSOR 1
4.CHECK OUTPUT SIGNAL FOR ECM. Measure the voltage between ECM connector and chassis ground. Connector & terminal (E158) No. 44 (+) — Chassis ground (−):	Is the voltage 4.95 V or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2198 A/F / O2 SENSOR SIGNAL BIASED/STUCK RICH BANK 2 SENSOR 1	Replace the front oxygen (A/F) sensor. Front Oxygen (A/F) Sensor
5.CHECK OUTPUT SIGNAL FOR ECM. Measure the voltage between ECM connector and chassis ground. Connector & terminal (E158) No. 45 (+) — Chassis ground (−): (E158) No. 44 (+) — Chassis ground (−):	Is the voltage 8 V or more-	Repair the short circuit to power in the harness between ECM connector and front oxygen (A/F) sensor connector. After repair, replace the ECM. Engine Control Module (ECM)	Repair the poor contact of ECM connector.

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P2196. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2196 A/F /O2 SENSOR SIGNAL BIASED/STUCK RICH BANK 1 SENSOR 1

Dtc p2272 o2 sensor signal biased/stuck lean bank 2 sensor 2

DTC DETECTING CONDITION:Detected when two consecutive driving cycles with fault occur.CAUTION:After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and I ...

Dtc p2197 a/f / o2 sensor signal biased/stuck lean bank 2 sensor 1

Other materials:

Diagnostics with phenomenon inspection
SymptomsFaulty partsStall speed is low after warming-up, with select lever in “D” or “R” range.Engine control systemVehicle does not move despite engine speed rising up, with select lever in “D” or “R” range.• Engine control system• Select ...