DTC P0058 Ho2S Heater Control Circuit High (Bank 2 Sensor 2): Wiring Diagram

Fig 1: HO2S - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR.  Turn the ignition switch to OFF. Measure the voltage between ECM and chassis ground. Connector & terminal  (B135) No. 5 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Repair the short circuit of harness to power supply between ECM and rear oxygen sensor connector.	Go to step 2.
2 CHECK GROUND CIRCUIT FOR ECM.  Disconnect the connector from ECM. Measure the resistance between ECM and chassis ground. Connector & terminal  (B134) No. 3 - Chassis ground:  (B134) No. 4 - Chassis ground:  (B134) No. 6 - Chassis ground:  (B137) No. 1 - Chassis ground:  (B137) No. 3 - Chassis ground:  (B137) No. 5 - Chassis ground:	Is the resistance less than 5 Ω?	Repair the poor contact of ECM connector.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between ECM and engine ground Poor contact of coupling connector