Why Does My Catalytic Converter Make Noise?

Why Does My Catalytic Converter Make Noise? Rattling noise Rattling noises are another symptom of a bad or failing catalytic converter. If a catalytic converter becomes old or damaged internally from excessively rich fuel mixtures, the catalyst coated honeycomb meshes on the inside of the converter can collapse or break apart, causing a rattle.Jan 5, … Continue reading Why Does My Catalytic Converter Make Noise?