Understanding Catalytic Converter Problems

Catalytic converters are often unintentionally mistreated

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[irench]

BOOM!!! closed loop<<< initiates feed back monitoring... NOT open loop.. Open loop operation is done on a time schedule from 1st revolution detected to thermostat open and varies heavily on manufacturer.
HEGO as well as AFR sensors replaced the front O2 feedback. All designed to keep the vehicle running as close to lambda or stoichiometric as possible. Sometimes produced? Burning of any carbon fuel sorce will result in NOx production which is the real evil gas. Regardless, 1 pound in a pound will come out. It's a physics thing, so the idea is to convert the unwanted chemicals, into less unwanted. Nature would eventually break them down but accelerating the process is desired So a catalyst is empolyed. As well as EGR or Cam phase to control combustion temperature and lower that evil NOx.