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Subaru Legacy Service Manual: Dtc p2197 a/f / o2 sensor signal biased/stuck lean bank 2 sensor 1

Subaru Legacy Service Manual / Engine (diagnostics)(h6do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p2197 a/f / o2 sensor signal biased/stuck lean 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

STEPCHECKYESNO

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 P2197 A/F / O2 SENSOR SIGNAL BIASED/STUCK LEAN 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 of harness between ECM connector and front oxygen (A/F) sensor connector.

Connector & terminal

(E158) No. 45 — (E24) No. 3:

(E158) No. 44 — (E24) No. 4:

Is the resistance less than 1 --

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2197 A/F / O2 SENSOR SIGNAL BIASED/STUCK LEAN BANK 2 SENSOR 1

Repair the harness and connector.

NOTE:

In this case, repair the following item:

Open circuit in harness between ECM connector and front oxygen (A/F) sensor connector

Poor contact of coupling 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 P2195. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2195 A/F /O2 SENSOR SIGNAL BIASED/STUCK LEAN BANK 1 SENSOR 1

Dtc p2198 a/f / o2 sensor signal biased/stuck rich bank 2 sensor 1
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Other materials:

Preparation tool
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