Catalytic Converter System

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

The WU-TWC and the 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.

WU-TWC (ATTACHED TO THE CYLINDER HEAD) 

Fig 1: Identifying Warm Up Three Way Catalyst

Courtesy of AMERICAN HONDA MOTOR CO., INC.

TWC (UNDER THE FLOOR) 

Fig 2: Identifying Under Floor Three Way Catalyst And Housing

Courtesy of AMERICAN HONDA MOTOR CO., INC.