What are the symptoms of a faulty catalytic converter?

[AmaraLynn]

Faulty catalytic converters may exhibit the following symptoms: Engine issues: Engine overheating, loss of power, abnormal noises, and unusual odors in exhaust emissions. Ignition difficulties: Disruption in the air-fuel mixture concentration, leading to hard starting or incomplete combustion. When the catalytic converter fails, the secondary oxygen sensor cannot provide accurate data to the ECU, resulting in either too lean or too rich fuel mixtures. A lean mixture can cause ignition problems, weak acceleration, and engine backfiring; while a rich mixture increases fuel consumption, causes incomplete combustion, and leads to severe spark plug carbon buildup. Increased exhaust backpressure: Deteriorated emissions. Due to fuel system or ignition system malfunctions, engine overheating, or backfiring, the catalytic converter substrate may sinter, flake off, increasing exhaust resistance and worsening emissions.