P0421

The P0421 code indicates "Warm Up Catalyst Efficiency Below Threshold (Bank 1)" in a 2017-2023 Genesis G70 IG, suggesting an issue with the catalytic converter's efficiency during its warming phase.

The P0421 code indicates that the catalytic converter's efficiency is below the threshold for the Genesis G70 IG (2017-2023), suggesting potential issues with the catalytic converter, oxygen sensors, or exhaust system.

The P0421 code in a 2017-2023 Genesis G70 indicates an issue with the Warm Up Catalyst Efficiency Below Threshold (Bank 1), suggesting a problem with the catalytic converter or upstream components affecting its performance.

The P0421 code indicates "Warm-Up Catalyst Efficiency Below Threshold (Bank 1)" for the 2017-2023 Genesis G70 IG. This issue suggests that the catalytic converter is not functioning as efficiently as expected during the warm-up phase.