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 MANUALSHYUNDAI2003ACCENT GL, 2D HATCHBACK, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMSELF-DIAGNOSTICS
2003 Hyundai Accent GL, 2D Hatchback, Standard
Engine Performance: System: Self-Diagnostics
2003 Hyundai Accent GL, 2D Hatchback, StandardSECTION Self-Diagnostics
- Introduction
- Self-Diagnostic System
- Connector Terminal Identification
- Diagnostic Trouble Code Definitions
- Diagnostic Tests
- DTC P0106, DTC P0107 & DTC P0108
- DTC P0111, DTC P0112 & DTC P0113
- DTC P0116, DTC P0117 & DTC P0118
- DTC P0121, DTC P0122 & DTC P0123
- DTC P0130, DTC P0136 & DTC P0140
- DTC P0131 & DTC P0137
- DTC P0132 & DTC P0138
- DTC P0133 & DTC P0134
- DTC P0171 & DTC P0172
- DTC P0261, DTC P0262, DTC P0264, DTC P0265, DTC P0267, DTC P0268, DTC P0270 & DTC P0271
- DTC P0300: Multiple Cylinder Misfire Detected
- DTC P0301, DTC P0302, DTC P0303 & DTC P0304
- DTC P0325: Knock Sensor Circuit Malfunction
- DTC P0335 & DTC P0336
- DTC P0340: Camshaft Position Sensor Circuit Malfunction (Bank 1 Or Single Sensor)
- DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1)
- DTC P0444 & DTC P0445
- DTC P0506 & DTC P0507
- DTC P1307, DTC P1308 & DTC P1309
- DTC P1505 & DTC P1507
- DTC P1506 & DTC P1508
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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.