Function

Exhaust system
The three-way catalytic converter (TWC) acts by oxidizing carbon monoxide (CO) and hydrocarbons (HC) to water and carbon dioxide (C02). Nitrous oxides (NOx) are reduced to nitrogen and water. Over 98% of these substances are converted in the three-way catalytic converter (TWC) during normal driving. Lead pollutants in the fuel damage the three-way catalytic converter (TWC) and can quickly render it unusable.