TSB : Removal Procedure

Details

Fig 1: Identifying Rear Heated Oxygen Sensor & Connector Position Assurance Retainer (3.5L) Courtesy of GENERAL MOTORS CORP. Remove the muffler assembly. Refer to Muffler Replacement . Remove the connector position assurance (CPA) retainer (1). IMPORTANT: The heated oxygen sensor (HO2S) 2 uses a permanently attached pigtail and connector. This pigtail should not be removed from the sensor. Damage or removal of the pigtail or connector will affect proper operation of the sensor. Disconnect the HO2S electrical connector (2). Fig 2: Identifying HO2S Courtesy of GENERAL MOTORS CORP. Remove the HO2S (2) using the J 39194-B . Fig 3: Identifying Front Catalytic Converter Components (3.5L) Courtesy of GENERAL MOTORS CORP. Remove the front catalytic converter to rear catalytic converter nuts (3). (Powertrain shown removed for clarity). Fig 4: Identifying Rear Catalytic Converter Components (3.5L) Courtesy of GENERAL MOTORS CORP. Remove the catalytic converter bolt (4) and nuts (1) at the exhaust manifold. Remove the rear catalytic converter 3). Remove and discard the gasket (2). Inspect the catalytic converter-to-exhaust manifold flange. Catalytic Converter to Manifold Flange Warpage: Service Limit: 0.7 mm (0.028 in) max. Standard: 0.7 mm (0.028 in) max.