GM 10384206
Catalytic Converter

Begin Catalytic Converter replacement by properly elevating the vehicle. Remove the connector from the Oxygen Sensor that is attached to the floor reinforcement before removing its clips from the frame structure. Remove the connector position assurance retainers alongside the Oxygen Sensor electrical connectors from the system. First remove Oxygen Sensor electrical connections from attachments on the hose clip and transmission crossmember before you re-attach the cpa retainers together with Oxygen Sensor electrical connectors (1, 2). Disassemble the exhaust system by removing exhaust manifold pipe nuts at each side and exhaust muffler nuts then pull out the transmission support before getting rid of the Catalytic Converter. Remove the oxygen sensors when necessitated. The threads of old oxygen sensors require gm p/n 12377953 or equivalent anti-seize compound before installation and tightening to 42 nm (31 ft. Lbs.) torques. You need to install both the Catalytic Converter and transmission support. New exhaust manifold pipe seals should be installed to each exhaust manifold followed by a right and left exhaust manifold pipe nut snug rotation to a torque setting of 50 nm (37 ft. Lbs.). Screw and tighten exhaust muffler nuts until they reach 45 nm (33 ft. Lbs.). Link the Oxygen Sensor electrical connectors (1, 2) and install cpa retainers before fastening the oxygen sensors electrical connectors to a hose clip supported by the transmission crossmember. You should lower the vehicle before performing these steps: install the clip around the engine harness and the Oxygen Sensor pigtail, clip the Oxygen Sensor connection to the floor reinforcement, reattach the cpa retainers then Oxygen Sensor electrical connectors, and lastly install the clip.