DTC P013A O2 Sensor Slow Response - Rich To Lean Bank 1 Sensor 2: Notes

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Clear Memory Mode . and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Inspection Mode .
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 .

Fig 1: O2 Sensor Slow Response (Rich To Lean Bank 1 Sensor 2) - Wiring Diagram

G11270524

Courtesy of SUBARU OF AMERICA, INC.

CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR.
1. Turn the ignition switch to OFF.
2. Disconnect the connector from rear oxygen sensor.
3. Disconnect the connector from ECM.
4. Measure the resistance of harness between ECM and rear oxygen sensor connector.
  Connector & terminal
  
  (E158) No. 16 - (E25) No. 4:
Is the resistance less than 1 Ω?
- Yes : Go to 2.
- No : Repair the open circuit of harness between ECM and rear oxygen sensor connector.
CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR.
Measure the resistance between rear oxygen sensor connector and engine ground.

Connector & terminal

(E25) No. 4 - Engine ground:

Is the resistance 1 MΩ or more?
- Yes : Go to 3.
- No : Repair the ground short circuit of harness between ECM and rear oxygen sensor connector.
CHECK REAR OXYGEN SENSOR.
Measure the resistance between rear oxygen sensor terminals.

Terminals

No. 3 - No. 4

Is the resistance less than 1 Ω?
- Yes : Replace the rear oxygen sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Rear Oxygen Sensor .
- No : Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis.
  NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.