DTC P0130 A/F/O2 Sensor Circuit Bank 1 Sensor 1: Notes

DTC DETECTING CONDITION:

Immediately at fault recognition

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to OPERATION , Clear Memory Mode.>, and Inspection Mode <Ref. to PROCEDURE , Inspection Mode.>.
Use the check board when measuring the ECM terminal voltage and resistance.

WIRING DIAGRAM:

Engine Electrical System <Ref. to WIRING DIAGRAM , Engine Electrical System.>

Fig 1: A/F/O2 Heater Control Circuit Low Bank 1 Sensor 1 - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK FRONT OXYGEN (A/F) SENSOR DATA. Start the engine and warm up engine until coolant temperature is higher than 75°C (167°F). Idle the engine for one minute or more. Read the value of «A/F Sensor #11» using the Subaru Select Monitor or a general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, refer to "Current Data Display For Engine". <Ref. to 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 #11» 1.20 - 3.00 V?	Go to step 2 .	Go to step 3 .
2 CHECK FRONT OXYGEN (A/F) SENSOR DATA. Race the engine so that the engine speed reaches 3, 000 rpm. (Five times in total) Read the value of «A/F Sensor #11» at racing using the Subaru Select Monitor or a general scan tool. NOTE: To increase engine speed to 3, 000 rpm, slowly depress accelerator pedal for approximately 5 seconds, and quickly release accelerator pedal to decrease engine speed. Normally, the air fuel ratio is rich during racing.	Is the value of «A/F Sensor #11» 2.5 V or more?	Go to step 5 .	Go to step 3 .
3 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connectors from front oxygen (A/F) sensor. Measure the resistance of harness between ECM connector 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?	Go to step 4 .	Repair the open circuit of harness between ECM connector and front oxygen (A/F) sensor connector.
4 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. Measure the resistance between the ECM connector 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?	Go to step 5 .	Repair the short circuit to ground in harness between ECM connector 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?	Repair or replace faulty parts.	Replace the front oxygen (A/F) sensor. <Ref. to Front Oxygen (A/F) Sensor .>