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 MANUALSGENESIS2020G90 3.3T PREMIUM, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM DIAGNOSIS - 3.3L (2 OF 5)DTC P0139-00: O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1/SENSOR 2)VERIFICATION OF REPAIRVERIFICATION OF VEHICLE REPAIR
2020 Genesis G90 3.3T Premium, AWD
Verification Of Vehicle Repair
2020 Genesis G90 3.3T Premium, AWDSECTION Verification Of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
- Connect GDS and select "DTC" button.
- Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed". If not, drive the vehicle within conditions noted in the freeze frame data or Enable conditions
- Read "DTC Status" parameter.
- Is parameter displayed "History (Not Present)" displayed?
YES
- System performing to specification at this time. Clear the DTC.
NO
- Go to the applicable troubleshooting procedure.
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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.