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 MANUALSHYUNDAI2003XG350 LREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM DIAGNOSIS (2 OF 2)DIAGNOSTIC TESTSDTC P0421: WARM UP CATALYST EFFICIENCY BELOW THRESHOLD (BANK 1)GENERAL INFORMATIONDTC DETECTING CONDITION
2003 Hyundai XG350 L
General Information: DTC Detecting Condition
2003 Hyundai XG350 LSECTION DTC Detecting Condition
DTC DETECTING CONDITION CHART
| Item | Detecting Condition | Possible cause |
|---|---|---|
| DTC Strategy |
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| Enable Conditions |
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| Threshold value |
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| Diagnosis Time |
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| MIL On Condition |
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RENDER: 1.0x
NO RELATED
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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.