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.

2004 Hyundai Accent BaseFACTORY OEM SERVICE PROCEDURE

Component Inspection

Check HO2S heater
1. Measure resistance between terminal 3 and 4 of sensor connector (To sensor side)
  Specification: 176°C: 8.0~14.0Ω
  
  Fig 1: Measuring Resistance Between Terminal 3 And 4 Of Sensor Connector
  Courtesy of HYUNDAI MOTOR CO.
2. Is measure resistance within Specification?
  YES
  - Substitute with a known good PCM and check for proper operation. If the problem is corrected, replace PCM and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Substitute with a known-good HO2S heater and check for proper operation. If the problem is corrected, replace HO2S heater and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

Factory Service Tools

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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.