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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 739 (FUEL SYSTEM & EMISSIONS SYSTEM)SYSTEM DESCRIPTIONCATALYTIC CONVERTER SYSTEM
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Catalytic Converter System

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Catalytic Converter System
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.

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
G06429195Courtesy of AMERICAN HONDA MOTOR CO., INC.

TWC (UNDER THE FLOOR) 

Fig 2: Identifying Under Floor Three Way Catalyst And Housing
G06429196Courtesy of AMERICAN HONDA MOTOR CO., INC.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.