Removal Procedure

Disconnect battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
Disconnect the heated oxygen sensor 1 wiring harness connector. Refer to Heated Oxygen Sensor Replacement - Sensor 1 .
Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement (1.8L LUW and LWE) and Exhaust Manifold Heat Shield Replacement (1.4L LUV) .
Loosen the three way warm up catalytic converter V-clamp bolt (2) so that the three way warm up catalytic converter V-clamp (1) can be removed from catalytic converter to turbocharger flange.

Fig 1: V-Clamp And Bolt
Courtesy of GENERAL MOTORS COMPANY
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
Remove the engine front compartment insulator if equipped. Refer to Front Compartment Insulator Replacement
Remove and DISCARD the 3 catalytic converter flange nuts (2).

Fig 2: Catalytic Converter
Courtesy of GENERAL MOTORS COMPANY

WARNING: Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges from worn exhaust components could result in serious personal injury.

CAUTION: Do not bend the exhaust flex pipe more than 10 degrees in any direction. Bending of more than 10 degrees or twisting in a range of ±0.5 degrees will damage the exhaust flex decoupler.
Remove the catalytic converter (3) from the three way warm up catalytic converter and hang aside.
Remove the catalytic converter gasket (1).
Remove the 2 three way warm up catalytic converter bracket nuts (1) and (2).

Fig 3: Catalytic Converter Bracket Nuts
Courtesy of GENERAL MOTORS COMPANY
Remove the three way warm up catalytic converter and the three way warm up catalytic converter to turbocharger seal ring.
Remove the heated oxygen sensor 1 from the three way warm up catalytic converter. Refer to Heated Oxygen Sensor Replacement - Sensor 1 .