What are the symptoms of a clogged three-way catalytic converter?

[NoahFitz]

The symptoms of a clogged three-way catalytic converter can be divided into three stages based on severity: 1. Mild clogging stage: Chemical complexes adsorb onto the catalyst surface, manifesting only as reduced exhaust purification function and excessive exhaust emissions, often visible as colored smoke from the tailpipe; 2. Moderate clogging stage: Chemical complexes have accumulated to a certain extent on the catalyst surface, at this stage exhaust backpressure increases, fuel consumption rises, and power decreases, typically accompanied by the illumination of the engine warning light; 3. Severe clogging stage: Due to significant blockage, the working temperature of the three-way catalytic converter rises, presenting as severe power loss, frequent stalling, and in extreme cases, glowing red exhaust pipes, abnormal noises, and foul-smelling exhaust fumes.