DTC P2196: A/F/O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1: Notes

1. - 

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>ENGINE ELECTRICAL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK FRONT OXYGEN (A/F) SENSOR CONNECTOR AND COUPLING CONNECTOR  .

   Check the 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 (OPEN)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from ECM.
   3. Disconnect the connector from the front oxygen (A/F) sensor.
   4. Measure the resistance of harness between ECM connector and front oxygen (A/F) sensor connector.

      Connector & terminal 

      (E158) No. 3 - (B379) No. 3:

      (E158) No. 4 - (B379) No. 4:

   Is the resistance less than 1 Ω?

   Yes  : Go to  3.

   No  : Check the harnesses and connectors, and repair or replace them if necessary.

   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?

   Yes  : Repair the poor contact of front oxygen (A/F) sensor connector.

   No  : Replace the front oxygen (A/F) sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>FRONT OXYGEN (A/F) SENSOR .