Catalytic Converter System

Warm Up/Three Way Catalytic Converter (WU-TWC) and Under-Floor Three Way Catalytic Converter (TWC) 

The WU-TWC/TWC converts hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) in the exhaust gas to carbon dioxide (CO₂ ), nitrogen (N₂ ), and water vapor.

WU-TWC: 

Fig 1: Identifying Three Way Catalytic Converter (WU-TWC)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

TWC: 

Fig 2: Identifying Under-Floor Three Way Catalytic Converter (TWC)

Courtesy of AMERICAN HONDA MOTOR CO., INC.