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.

2012 Hyundai Accent GLS, Automatic TransFACTORY OEM SERVICE PROCEDURE

Component Inspection

Visual Check
1. IG KEY "OFF".
2. Disconnect HO2S (S1) connector.
3. Check that HO2S (S1) is contaminated or damaged by foreign materials.
4. Has a problem been found?
  YES
  - Go to " 2 Check HO2S (S1) performance" as follows.
  NO
  - Substitute with a known - good HO2S (S1) and check for proper operation. If the problem is corrected, replace HO2S (S1) and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check HO2S (S1) performance
1. IG KEY "OFF".
2. Connect probe to signal terminal of HO2S (S1) connector and select oscilloscope function with GDS.
3. Warm up the engine to normal operating temperature.
4. Measure signal waveform of HO2S (S1) with GDS.
  Specification: Refer to SIGNAL WAVEFORM & DATA
  
  Fig 1: Measuring Signal Waveform Of HO2S (S1) With GDS
  Courtesy of HYUNDAI MOTOR AMERICA

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.