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:

After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to ENGINE (DIAGNOSTICS) (H4DO)>CLEAR MEMORY MODE>OPERATION ., and inspection mode Ref. to ENGINE (DIAGNOSTICS) (H4DO)>INSPECTION MODE>PROCEDURE .
Use the check board when measuring the ECM terminal voltage and resistance.

Wiring diagram:

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

Courtesy of SUBARU OF AMERICA, INC.

CHECK FRONT OXYGEN (A/F) SENSOR CONNECTOR .
Check the front oxygen (A/F) sensor connector.

Has water entered the connector?

Yes: Completely remove any water inside.

No: Go to 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. 46 - Chassis ground:
  
  (E158) No. 33 - Chassis ground:
Is the resistance 1 MΩ or more?

Yes: Go to 3 .

No: Repair the short circuit to ground in harness between ECM connector and front oxygen (A/F) sensor connector.
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. 46 (+) - Chassis ground (-):
Is the voltage 4.5 V or more?

Yes: Go to 5 .

No: Go to 4 .
CHECK OUTPUT SIGNAL FOR ECM .
Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(E158) No. 33 (+) - Chassis ground (-):

Is the voltage 4.95 V or more?

Yes: Go to 5 .

No: Replace the front oxygen (A/F) sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>FRONT OXYGEN (A/F) SENSOR .
CHECK OUTPUT SIGNAL FOR ECM .
Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(E158) No. 46 (+) - Chassis ground (-):

(E158) No. 33 (+) - Chassis ground (-):

Is the voltage 8 V or more?

Yes: Repair the short circuit to power in the harness between ECM connector and front oxygen (A/F) sensor connector. After repair, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>ENGINE CONTROL MODULE (ECM) .

No: Repair the poor contact of ECM connector.