Excess fuel could be one reason. The check engine light should be illuminated. Check the codes and re-post results.
Your converter is clogged and needs replacing.
The converter is plugged and needs to be replaced
Either the converter is partially clogged and needs replacing or you have a miss in the engine which is dumping raw fuel into the converter where it is being burned.
Partially clogged or engine misfire.
Yes, an engine misfire will cause this and will ruin the converter. It may also be partially clogged.
Partially clogged! Y-THINK-Y
A partially clogged converter will cause this. Also an overly rich fuel/air mixture or a cylinder misfire is a cause.
You can still program the remote with the converter box off if you know the code. Then Use it to turn the converter on.
ignition control module have it tested befor you leave the part store
It is partially clogged, cylinder miss, or the fuel/air mixture is too rich.
check the catalytic converter. if the engine isisnt running hotter than normal it is most likely plugged exhaust somewhere likely in the catalytic converter
It is clogged or you have a miss on the driver side bank of the engine which is causing raw fuel to be dumped into the converter where it is burning. If you find your engine is running fine and has no miss then the converter is clogged.