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 MANUALSHYUNDAI2005SANTA FE GLS, 2.7 D, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM DIAGNOSIS (2.7L) (1 OF 2)DTC TROUBLESHOOTING PROCEDURESDTC P0038: HO2S HEATER CIRCUIT HIGH (BANK 1/SENSOR 2)CONTROL CIRCUIT INSPECTION

2005 Hyundai Santa Fe GLS, 2.7 D, AWD

Control Circuit Inspection

2005 Hyundai Santa Fe GLS, 2.7 D, AWDSECTION Control Circuit Inspection

Check for open in control harness
1. Ignition "OFF"
2. Disconnect HO2S and ECM connectors.
3. Measure resistance between terminals 4 of the HO2S heater harness connector and 7 of the ECM harness connector.
  Specification: Approx. 0Ω
  
  Fig 1: Measuring Resistance Between Terminals 4 Of HO2S Heater Harness Connector And 7 Of ECM Harness Connector
  Courtesy of HYUNDAI MOTOR CO.
4. Is resistance within the specification?
  YES
  - Go to next step.
  NO
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for short to power in control circuit.
1. Reconnect the ECM connector.
2. Ignition "ON" & Engine "OFF".
3. Measure voltage between terminal 4 of the HO2S heater harness connector and chassis ground.
  Specification: Approx. ΩV
  
  Fig 2: Measuring Voltage Between Terminal 4 Of HO2S Heater Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
4. Is voltage within the specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

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.