What does TWC mean in UNCLASSIFIED

A three-way catalytic converter has two major internal components: a ceramic monolith substrate with a honeycomb structure and one or more catalyst layers. The substrate provides a large surface area for better pollutant conversion efficiency, while the catalyst layers consist of noble metals such as palladium, platinum and rhodium that act as chemical agents to facilitate the conversion of pollutants.

Three-way catalytic converters are designed to reduce emissions of carbon monoxide, hydrocarbons, and nitrogen oxides (NOx). Carbon monoxide is converted into mostly harmless carbon dioxide, while hydrocarbons are converted into water vapor and carbon dioxide. Nitrogen oxides are converted into nitrogen and oxygen.

In general, you should replace your vehicle's three way catalyst every 80,000 miles or so; however, this can vary depending on the type of vehicle you own and driving conditions. It is always best to check with your vehicle manufacturer for specific service intervals.

Over time, your vehicle's 3-Way Catalytic Converter will become clogged due to accumulated contaminants from normal driving conditions. This can lead to reduced engine power and increased fuel consumption due to decreased airflow through the converter. Over time it can also cause engine misfires and stalling. Regular replacement will prevent these problems from occurring.

No — cleaning your Three Way Catalytic Converter is not recommended as it doesn't usually fix any issues with performance or emissions output. If you want to get your car running efficiently again after experiencing these problems then the safest option is always replacing the entire unit rather than attempting any kind of cleaning solution.