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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (Diagnostics) (P2101 To U171F) (H4DOTC) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P2195 A/F/O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1 >> Notes

DTC P2195 A/F/O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1: Notes

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

CAUTION:

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .

Fig 1: A/F/O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1 - Wiring Diagram
G11270520Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK FRONT OXYGEN (A/F) SENSOR CONNECTOR AND COUPLING CONNECTOR. 

    Has water entered the connector?

    • Yes  : Completely remove any water inside.
    • No  : Go to 2. 
  2. CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from front oxygen (A/F) sensor.
    3. Disconnect the connector from ECM.
    4. Measure the resistance of harness between ECM and front oxygen (A/F) sensor connector.

      Connector & terminal 

      (E158) No. 15 - (E24) No. 1:

      (E158) No. 27 - (E24) No. 4:

      (E158) No. 39 - (E24) No. 5:

      Is the resistance less than 1 Ω?

    • Yes  : Go to 3. 
    • No  : repair the harness and connector.
      NOTE: In this case, repair the following item:
      • Open circuit in harness between ECM 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?