My car is throwing the po430 code I had the catalytic converter's both checked and they're all running smoothly what may be the issue?

Hello, You may have one of the following issues: -Bad O2 sensor(s) -Vacuum or intake leaks -fuel system issues -PCM failure For vacuum leaks, you can use a fine mist of water from a spray bottle, spraying all over the engine one spot at a time, and listen for the engine tone to change. This will help you identify a leak. Other than that, you really should use a professional for further diagnosis.