What are the precursors of catalytic converter damage?

[AdrielMarie]

The precursors of catalytic converter damage are: 1. Shortly after starting the vehicle, there is a noticeable red-hot phenomenon between the exhaust manifold and the catalytic converter; 2. When accelerating, you may hear a "hissing" sound of air leakage and "gurgling" noises; 3. A too-lean catalytic converter can cause difficulty in ignition, lack of power, and engine backfiring, while a too-rich condition can lead to incomplete combustion, severe carbon deposits in the cylinders and spark plugs, and the engine warning light should illuminate when this fault occurs; 4. A pungent, foul odor can be detected during idling or acceleration; 5. A normally functioning catalytic converter has a lower temperature at the front than at the rear. If the front temperature is higher than the rear, it indicates poor catalyst performance.