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HOMESERVICE MANUALSHYUNDAI2005SANTA FE GLS, 2.7 D, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 (ENGINE CONTROL SYSTEM DIAGNOSIS (3.5L) (1 OF 2))DTC TROUBLESHOOTING PROCEDURESDTC P0051: HO2S HEATER CIRCUIT LOW (BANK2/SENSOR 1)POWER CIRCUIT INSPECTION
2005 Hyundai Santa Fe GLS, 2.7 D, AWD

Power Circuit Inspection

2005 Hyundai Santa Fe GLS, 2.7 D, AWDSECTION Power Circuit Inspection
WARNING: This page is about a different variant/trim than selected.
  1. Check Voltage
    1. Ignition "OFF"
    2. Disconnect HO2 sensor connector
    3. Ignition "ON" & Engine "OFF"
    4. Measure voltage between terminal 3 of HO2 sensor harness connector and chassis ground.

      Specification : Approx. B+

      Fig 1: Measuring Voltage Between Terminal 3 Of HO2 Sensor Harness Connector And Chassis Ground
      G03845361Courtesy of HYUNDAI MOTOR CO.
    5. Is the measured voltage within specification?

      YES 

      NO 

      • Go to next step .
  2. Check for open in harness
    1. Ignition "OFF"
    2. Disconnect HO2 sensor and PCM connector
    3. Measure resistance between terminal 3 of HO2 sensor harness connector and terminal 87 of Control Relay harness connector.

      Specification : Approx. below 1Ω

      Fig 2: Measuring Resistance Between Terminal 3 Of HO2 Sensor Harness Connector And Terminal 87 Of Control Relay Harness Connector
      G03845362Courtesy of HYUNDAI MOTOR CO.
    4. Is the measured resistance within specification?

      YES 

      NO 

      • Check for open in harness.
      • Check that fuse between HO2S and Control Relay is installed or blown off.
      • Repair or replace as necessary. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
RENDER: 1.0x

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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.