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 MANUALSHYUNDAI2013GENESIS COUPE 2.0T PREMIUMREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 43 (ENGINE CONTROL SYSTEM (DTC TROUBLESHOOTING) (2 OF 3) - 2.0L)DTC P0420: CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1)MONITOR DTC STATUS
2013 Hyundai Genesis Coupe 2.0T Premium
Monitor DTC Status
2013 Hyundai Genesis Coupe 2.0T PremiumSECTION Monitor DTC Status
WARNING: This page is about a different car, the 2012 Hyundai Genesis Coupe. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If any codes relating to injectors, HO2S, ECT (Engine Coolant Temperature) Sensor, Throttle Position sensor or Mass Air Flow Sensor are stored, do ALL REPAIRS associated with those codes before proceeding with these troubleshooting steps.
- Connect GDS and select "DTC Analysis" mode
- Click "DTC Status" on the menu bar to see DTC's information.
- Confirm that "DTC Readiness Flag" indicates "COMPLETED". If not, drive the vehicle within conditions noted in the freeze frame data, or drive the vehicle within the "Enable Conditions" shown in DTC DETECTING CONDITION CHART.
- Read "DTC Status" parameter.
- Is parameter displayed "History (Not Present) fault"?NOTE:
- History (Not Present) fault: DTC occurred but has been cleared.
- Present fault: DTC is occurring at present time.
YES
- Fault is intermittent, caused by poor contact in the sensor's and/or ECM's connector, or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Go to the next Inspection procedure.
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.