DTC P0130 O2 Sensor Circuit (Bank 1 Sensor 1): Notes

DTC DETECTING CONDITION: 

Immediately at fault recognition

WIRING DIAGRAM: 

• Engine Electrical System TURBO MODEL (WITHOUT PUSH BUTTON START) Ref. to WIRING SYSTEM > Engine Electrical System >  TURBO MODEL (WITHOUT PUSH BUTTON START)  .
• Engine Electrical System TURBO MODEL (WITH PUSH BUTTON START) Ref. to WIRING SYSTEM > Engine Electrical System >  TURBO MODEL (WITH PUSH BUTTON START)  .

1. CHECK FRONT OXYGEN (A/F) SENSOR DATA  .
   1. Start the engine and warm up engine until coolant temperature is higher than 75°C (167° F).
   2. Idle the engine for one minute or more.
   3. Using the Subaru Select Monitor or a general scan tool, read the value of [A/F Sensor #1].
      NOTE:

      • Subaru Select Monitor

        For detailed operation procedures, refer to "Current Data Display For Engine". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC) >  SUBARU SELECT MONITOR  .

      • General scan tool

      
      For detailed operation procedures, refer to the general scan tool operation manual.

   Is the value of [A/F Sensor #1] 1.20 - 3.00 V?

   Yes: Go to   2  .

   No: Go to   3  .

2. CHECK FRONT OXYGEN (A/F) SENSOR DATA  .
   1. Race the engine so that the engine speed reaches 3, 000 rpm. (Five times in total)
   2. Using the Subaru Select Monitor or a general scan tool, read the value of [A/F Sensor #1] at racing.
      NOTE:

      • Slowly depress the accelerator pedal to increase engine speed up to 3, 000 rpm, keep it for approximately 5 seconds, and quickly release the accelerator pedal to decrease engine speed.
      • Normally, the air fuel ratio is rich during racing.

   Is the value of [A/F Sensor #1] 2.5 V or more?

   Yes: Go to   5  .

   No: Go to   3  .

3. 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 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   4  .

   No: Repair the open circuit of harness between ECM and front oxygen (A/F) sensor connector.

4. CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR  .

   Measure the resistance between ECM and engine ground.

   Connector & terminal 

   (E158) No. 15 - Engine ground:

   (E158) No. 27 - Engine ground:

   (E158) No. 39 - Engine ground:

   Is the resistance 1 MΩ or more?

   Yes: Go to   5  .

   No: Repair the ground short circuit of harness between ECM and front oxygen (A/F) sensor connector.

5. CHECK EXHAUST SYSTEM  .

   Check exhaust system parts.

   NOTE: Check the following items.

   • Looseness and improper fitting of exhaust system parts
   • Damage (crack, hole etc.) of parts
   • Looseness of front oxygen (A/F) sensor
   • Loose part and improper installation between front oxygen (A/F) sensor and rear oxygen sensor

   Is there any fault in exhaust system?

   Yes: Repair or replace faulty parts.

   No: Replace the front oxygen (A/F) sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC) >  FRONT OXYGEN (A/F) SENSOR  .