2020 G70 3.3T CEL with P0420 and P0430 - Catalytic Converter?

ClearTheCode guidance (Genesis · Diagnostics & codes)

Summary: For 2020 G70 3.3T CEL with P0420 and P0430 - Catalytic Converter?, work through these steps on your 2016+ vehicle:

1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
5. Test the common fix — follow model-specific service procedures; one change at a time.
6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: Hey everyone,

My Check Engine Light just came on in my 2020 Genesis G70 3.3T Sport. I used my OBD-II scanner and pulled two codes: P0420 (Catalyst System Efficiency Below Threshold Bank 1) and P0430 (Catalyst System Efficiency Below Threshold Bank 2).

I'm a bit worried because I know these codes often point to a failing catalytic converter. The car seems to be running fine, no noticeable loss o…

This is educational guidance, not a substitute for hands-on diagnosis.