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 MANUALSHYUNDAI2003TIBURON GT, AUTOMATICREPAIR AND DIAGNOSISENGINE MECHANICALFUEL SYSTEMENGINE CONTROLS - SYSTEM & COMPONENT TESTINGSENSORS & SWITCHESSENSORSHEATED OXYGEN SENSOR (HO2S)
2003 Hyundai Tiburon GT, Automatic
Heated Oxygen Sensor (HO2S)
2003 Hyundai Tiburon GT, AutomaticSECTION Heated Oxygen Sensor (HO2S)
- Accent, Elantra, Santa Fe 2.4L and 3.5L, Sonata 2.4L, Tiburon, and XG350 engines use Zirconium type HO2Ss that output 0-1 volt signal. Zero volts is lean and one volt is rich. Santa Fe 2.7L and Sonata 2.7L engines use HO2Ss that output 0-5 volt signal. Zero volts is rich and 5 volts is lean.
- To test HO2S on Accent, Elantra, Santa Fe 2.4L and 3.5L, Tiburon, and XG350, warm up engine. Backprobe between HO2S connector terminals No. 1 and 2. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. When suddenly decelerating from 4000 RPM, voltage should be 0.2 volt or less. When engine is suddenly raced, voltage should be 0.6-1.0 volt. With engine warmed up and idling, voltage should repeatedly alternate between 0.2 volt or less and 0.6 volt or more.
- To test HO2S on Santa Fe 2.7L and Sonata 2.7L, warm up engine. Backprobe between HO2S connector terminals No. 1 and 2. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. When engine is suddenly decelerated from 4000 RPM, voltage should be 4.0-5.0 volts. When engine is suddenly raced, voltage should be 0.5-1.0 volt.
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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.