OEM Chevrolet Avalanche 1500 Catalytic Converter

Chevrolet Avalanche 1500 Catalytic Converter Parts and Q&A

• Catalytic Converter
  19418928
  Q: How to replace the catalytic converter on Chevrolet Avalanche 1500?

  A:

  After supporting the vehicle and transmission with proper equipment, begin the Catalytic Converter replacement process. Start by removing the transmission mount nuts to transmission support then lift the transmission away from the support before you extract the transmission support crossmember bolts and nuts leading to the crossmember's removal. The engine harness along with its oxygen sensor pigtail requires clip removal. After that disconnect the connector position assurance (CPA) retainers and oxygen sensor electrical connectors. Unclip oxygen sensor connectors both from the hose clip and transmission crossmember followed by a second disconnect of the oxygen sensor cpa retainers and electrical connectors (1, 2). Follow this sequence to remove the Catalytic Converter - first unfasten the left and right exhaust manifold pipe nuts and next disconnect the exhaust muffler nuts then remove the Catalytic Converter. You should apply gm p/n 12377953 anti-seize compound with equivalent material to old oxygen sensor threads before installation. Torque the sensors to 42 nm (31 ft. Lbs.). Drive the right and left exhaust manifold pipe nuts halfway by hand before torqueing them to 50 nm (39 ft. Lbs.). Next, install the new Catalytic Converter alongside new exhaust manifold pipe seals mounted on the exhaust manifolds. Use 40 nm (30 ft. Lbs.) torque when tightening all exhaust muffler nuts. The oxygen sensor electrical connectors (1, 2) and cpa retainers need installation before you secure the oxygen sensor electrical connectors to the hose clip and transmission crossmember. First tighten the transmission support crossmember bolts and nuts to 95 nm (70 ft. Lbs.) then reinstall the crossmember before installing the engine harness and oxygen sensor pigtail in their clips. Finally reattach the cpa retainers and oxygen sensor electrical connectors. Place the transmission mount on the support then bolt it to the transmission support nuts while torquing them to 40 nm (30 ft. Lbs.). Lower the vehicle while removing the transmission jack.