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 MANUALSHYUNDAI1991SONATA V6-3.0LREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONDIAGNOSTIC TROUBLE CODE DESCRIPTIONS
1991 Hyundai Sonata V6-3.0L
Diagnostic Trouble Code Descriptions
1991 Hyundai Sonata V6-3.0LSECTION Diagnostic Trouble Code Descriptions
Fig. 2 Trouble Codes:
There are 16 trouble codes which can be read using the Multi-Use Tester (MUT), Fig. 2. If more than 1 fault occurs, they will be indicated sequentially from smallest code number. Trouble codes can only be erased using multi-use tester.
Refer to DIAGNOSTIC CHARTS for diagnostic trouble code, indication, system interaction and possible causes.
Refer to DIAGNOSTIC CHARTS for service data and actuation test.
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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.