Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSSUBARU2005OUTBACK I, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - ENGINE (DIAGNOSTICS) (H4SO)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC P0032 H02S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1)

2005 Subaru Outback i, Standard

DTC P0032 H02S Heater Control Circuit High (Bank 1 Sensor 1)

2005 Subaru Outback i, StandardSECTION DTC P0032 H02S Heater Control Circuit High (Bank 1 Sensor 1)

DTC DETECTING CONDITION:

Detect as soon as malfunction occurs.
GENERAL DESCRIPTION < Ref. to DTC P0032 H02S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1) , Diagnostic Trouble Code (DTC) Detecting Criteria. >

CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. to , OPERATION , Clear Memory Mode.> and Inspection Mode < Ref. to , PROCEDURE , Inspection Mode.>.

WIRING DIAGRAM:

Fig 1: DTC P0032 H02S Heater Control Circuit High (Bank 1 Sensor 1)

Courtesy of SUBARU OF AMERICA, INC.

DTC P0032 H02S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1) DIAGNOSIS

Step	Check	Yes	No
1. CHECK OUTPUT SIGNAL FROM ECM. Turn the ignition switch to ON. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B134) No. 2 (+) - Chassis ground (-): (B134) No. 3 (+) - Chassis ground (-):	Is the voltage more than 8 V?	Go to step 2.	Go to step 3.
2. CHECK FRONT OXYGEN (A/F) SENSOR HEATER CURRENT. Turn the ignition switch to OFF. Repair the battery short circuit in harness between ECM and front oxygen (A/F) sensor connector. Turn the ignition switch to ON. Read the data of front oxygen (A/F) sensor heater current using Subaru Select Monitor or OBD-II general scan tool. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to , SUBARU SELECT MONITOR . > OBD-II general scan tool For detailed operation procedure, refer to the OBD-II general scan tool instruction manual .	Is the current more than 2.3 A?	Replace the ECM. < Ref. to ENGINE CONTROL MODULE (ECM) . >	END
3. CHECK OUTPUT SIGNAL FROM ECM. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B134) No. 2 (+) - Chassis ground (-): (B134) No. 3 (+) - Chassis ground (-):	Does the voltage change by shaking the ECM harness and connector?	Repair battery short circuit in harness between ECM and front oxygen (A/F) sensor connector.	END

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.