DTC P0130: O2 Sensor Circuit (Bank 1 Sensor 1): Wiring Diagram

Engine electrical system turbo engine model (without push button start) < Ref. to TURBO MODEL (WITHOUT PUSH BUTTON START) , WIRING DIAGRAM, Engine Electrical System. >
Engine electrical system turbo engine model (with push button start) < Ref. to TURBO MODEL (WITH PUSH BUTTON START) , WIRING DIAGRAM, Engine Electrical System. >

Fig 1: Front Oxygen Sensor Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DTC PROCEDURE

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 connectors from ECM and front oxygen (A/F) sensor connector. 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?	Go to step 4 .	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?	Go to step 5 .	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?	Repair or replace faulty parts.	Replace the front oxygen (A/F) sensor. < Ref. to FRONT OXYGEN (A/F) SENSOR . >