GM 15733231
Catalytic Converter

The Catalytic Converter should be serviced by first raising and supporting the vehicle. Take out the nuts from the y-pipe flat flange first and after that, pull out the Muffler and Catalytic Converter. After that, take out the nuts, studs and flange seals attached to the y-pipe and Exhaust Manifold. To start the installation, first, place the new flange seals and then put in the new studs and tighten them to 22 n.m (16 lb ft). Join the new nuts with the y-pipe and Catalytic Converter and while doing so use a torque wrench to tighten the nuts to 64 n.m (47 lb ft). Put the y-pipe and Catalytic Converter assembly over the flat flange and secure the nuts to the bolts that come out of the flat flange, tightening to 64 n.m (47 lb ft). Be sure all is clear and in good alignment before taking the vehicle down.

Service and repair of the Catalytic Converter requires raising the vehicle and providing support. First remove protective shields if needed before proceeding to remove the rear exhaust system. Begin by disconnecting the electrical connector from the Oxygen Sensor before removing the left Exhaust Manifold nuts for extractor of the left side Catalytic Converter. Transfer the oxygen sensors when replacing the Catalytic Converter. Start by installing new exhaust seals to the Exhaust Manifold before installing the left side Catalytic Converter. Mount new nuts onto the left side Exhaust Manifold before tightening them to 50 nm (39 ft. Lbs.). Attach the Oxygen Sensor electrical connector before reassemble the rear exhaust system. Complete the process by taking off safety stands while lowering the vehicle.

Remove the clamp holding the pipe to the turbo.

Reconnect the oxygen sensor electrical connections, check for clearance and alignment, and finally lower the vehicle.

Tighten it to 12 Nm (106 lb in).

Tighten the nuts to 64 Nm (47 ft lbs).

Remove the nuts, studs, and flange seals from the Y-pipe and exhaust manifold.