Catalytic Converter System

Warm-up Three Way Catalytic Converter (WU-TWC)/Three Way Catalytic Converter (TWC) 

The WU-TWC and TWC convert hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) in the exhaust gas to carbon dioxide (CO₂ ), nitrogen (N₂ ), and water vapor (H₂ O).

WU-TWC: 

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

Courtesy of AMERICAN HONDA MOTOR CO., INC.

TWC: 

Fig 2: Identifying Three Way Catalytic Converter (TWC)

Courtesy of AMERICAN HONDA MOTOR CO., INC.